None of our early ancestors could digest milk as adults because their bodies never had to ----milk drinking simply wasn’t an option. As people began to extract milk from animals, though, some people developed the ability to keep drinking it throughout their lives.
Scientists now know of a milk-related mutation ( 變異) in our genes -- the chemical instructions for life that we carry in almost every cell in our bodies. People who have a mutated form of one particular gene can drink milk just fine. People without the mutation tend to get sick from milk.
To figure out where, and possibly why, milk drinking started, some scientists have been looking at who has the milk-digesting mutation today. Patterns are striking.
Most adults in Northern and Central Europe are able to digest milk -- and they do. Cheese and butter and other dairy products are popular in countries such as Sweden, Denmark, Germany and England. Because European settlers dominated North America, most people here can handle milk just fine, as well. That may explain why ice cream is such a popular dessert in the United States.
In much of Africa, Asia and South America, on the other hand, people tend to avoid dairy products because they lead to diarrhea (腹瀉) and other stomach problems. (That’s why you won’t typically find cheese on the menu at a Chinese, Japanese or Ethiopian restaurant.) Native
Americans are also unable to digest milk.
Based on these genetic patterns, scientists have long thought that- milk drinking started inNorthern Europe, where dairy is an institution and the milk-digesting mutation is everywhere.
A recent study painted a different picture. With a computer medal, Thomas and colleagues looked at the spread of the milk-drinking mutation, farming and other related factor. Working backward, the scientists concluded that the first milk-thinkers lived in Central Europe around what’s now Hungary about 7,500 years ago. The practice didn't start farther north, as scientists had thought before.
66. Which of the following is the proper order of events according to the passage?
a. Their children were able to digest milk as adults.
b. They got sick from the milk.
c. Some people got a mutation in their genes.
d. Some people tried drinking milk from animals.
e. Some people started to drink milk from animals on a regular basis.
A. c→d→b→e→a   B. d→e→b→c→a  C. d →b→e→c→a   D. e→d→b→c→a
67. Most people in the USA can digest milk because __________.
A. they have strong stomachs              B. their ancestors were Europeans
C. that’s where milk drinking stinted       D. farmers raise a lot of cows there
68. Which of the following is LEAST likely to appear on the menu in a Japanese restaurant?
A. Butter.          B. Vinegar.          C. Fish.               D. Beef.
69. Which of the following is the author most likely to agree with?
A. Milk drinking first started in Northern Europe.
B. Milk drinking first started in Central Europe.
C. North American Indians were able to digest milk.
D. Dairy products are very popular in North Korea.
70. The main focus of the scientists' research was ______________.
A. mutation of human genes               B. development of the human stomach
C. why milk drinking started              D. where milk drinking first started
練習(xí)冊系列答案
相關(guān)習(xí)題

科目:高中英語 來源:不詳 題型:閱讀理解


There is no doubt that watching television and can influence the way that people behave. Moreover, it seems that people are spending more and more time watching some sort of visual entertainment, whether it is television, a video tape or a DVD. Therefore, the effects of visual media cannot be ignored.
One obvious effect of the these media is that watching them induces people to buy certain products. television advertising is widespread and, nowadays, even movie theaters permit advertisements. Another way TV and the movies affect people is that they give people either a broader view of the world or a distorted(扭曲的) one, depending on what type of program they watch. Those who watch news and educational program can learn many new things while those who watch primarily entertainment shows may come to believe that most people in the world possess great wealth and good looks. It may make them become dissatisfied with their own lives. Finally, perhaps the most susceptible(易受影響的)viewers are children, who may be unable to tell fact from fiction and may try to imitate acts that they see on TV or in the movies.
With the every-increasing popularity of video entertainment, society must pay attention to these effects. Television and movies, while entertaining and informative, cannot take the place of real experience.
10.From the passage, we know that watching television and movies can ________.
A. make people live better                                        B. make people feel pleased
C. make people change their way of life                           D. make people live worse
11 The writer holds the view that _______.
A.people may take no notice of the effects of the visual media
B.people must pay attention to the effects of the visual media
C.the effects of the visual media make the world changed greatly
D.the visual media only affect young people
12. Which of the following is TRUE according to the passage?
A.Those who watch news and educational programs can earn a lot of money and become very pretty.
B. The reason why most people possess great wealth and good looks is that they often watch television advertising.
C. People buy products only when they are induced by television advertising.
D. People who watch primarily entertainment shows may come to believe that most people in the world are rich and beautiful.
13.What would be the best title for the text?
A. The Influence of Television and Movies
B. The Reason Why People Watch Television and Movies
C. Television and Movies Induce People
D. The Importance of Television and Movies.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Winter depression (or winter blues) is a common affliction (折磨) for those who live in our northern climate. Its clinical name is seasonal affective disorder (or SAD) and up to 5% of the population (especially in northern states) may suffer from it. Seasonal affective disorder is characterized by feelings of sadness and depression that occur in the winter months when the temperatures drop and the days grow short . The depression is often associated with excessive eating or sleeping and weight gain. Women are twice to three times more likely to suffer from the winter blues than men.
There are many effective treatments for winter depression, some of which you can do to help yourself. Increasing your daily exposure to as much natural light as possible can be helpful to many. Any time that you have the opportunity to gain access to more sunlight in the winter months, you should try to do so. Taking walks throughout the day (even if you don’t normally do so), sitting next to a south-facing window at your office, in a classroom, or at home will increase your sunlight exposure. Exercising next to a window or outdoors (when possible) is another activity that can help.
Although it may be difficult to do, maintaining your schedule and lifestyle will help to keep the depression at bay. A regular pattern of sleep is the most important thing to maintain. It may be helpful, for instance, to have your bedroom lights on a timer to turn on a half-hour before you wake. This may help in waking at a regular time every morning, when it is still dark outside in the winter months.
Light therapy has shown to be an effective treatment for seasonal affective disorder. While you can purchase expensive, specialized light therapy lighting fixtures for your home or office, some inexpensive alternatives are also available. Another lighting technique to try is to replace commonly used light bulbs in your home with brighter full spectrum (also known as broad spectrum) light bulbs. While more expensive than regular light bulbs, these bulbs provide light that is similar to natural sunlight.
If none of these techniques seem to help your depressive symptoms, you should consider consulting your family physician or a mental health professional. The winter blues are a form of depression and can be readily treated w ith medications or psychotherapy when other self-help methods aren’t effective. Don’t be afraid to talk about this condition with a professional; it’s nothing to be ashamed or afraid of. With a little effort, the winter blues can be beaten
小題1: What do we know about winter depression?
A.It is very common where the weather is cold.
B.It may lead to weight gain.
C.It occurs when the temperatures drop.
D.It seldom affects men.
小題2:What is the most important factor in the therapy introduced in the second paragraph?
A.Exposure to natural light.
B.Sports in winter months.
C.Outdoor activities.
D.Sunlight through the window.
小題3:What does “to keep the depression at bay” mean in the third paragraph?
A.To shorten the duration of the depression.
B.To use light to resist the depression.
C.To keep the depression manageable and minimal.
D.To delay the occurrence of the depression.
小題4: For winter depression, light therapy ___________.
A.is much more effective than other kinds of therapy
B.is so expensive that some may not be able to afford it
C.encourages people to do outdoor exercises
D.needs specialized bulbs to replace ordinary ones
小題5:We can infer from the passage that __________.
A.self-help methods do not work 100% of the time
B.medications or psychotherapy is much more effective
C.mental health professionals don’t recommend self- help methods
D.most people prefer self-help methods to medications

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

Wine drinkers tend to buy healthier food than beer drinkers, according to a Danish study published on Tuesday on the website of a weekly medical magazine.
People who bought wine at the store were also more likely to buy fruit, vegetables, fish, lean meat (瘦肉) and milk than beer buyers did, said the study.
Beer buyers were more likely to buy frozen dinners, cold cuts, pork, sugary products, and soft drinks.
The study was conducted by four researchers from the National Institute of Public Health over the course of six months.
Alcohol researchers Erik Schulenburg and Marten Greenback and two other doctors collected 3.5 million receipts from 98 stores. The customers at the stores represented a large number of Danish people, they said.
“Our results confirm international studies which show that wine drinkers tend to eat more fruit, vegetables and fish and rarely eat fats, compared to those who like other kinds of alcoholic drinks,” they concluded.
Wine buyers also tended to have higher education levels, higher earnings and be in better mental health, they added.
Their interest in consumers’ shopping bags followed a series of studies in the Danish media. The studies suggested that wine drinkers ran a lower risk of cardiovascular (心血管的) disease and some types of cancer than beer drinkers.
小題1:The passage mainly tells us that wine drinkers ______.
A.eat more vegetables than beer drinkers
B.usually buy healthier food than beer drinkers
C.a(chǎn)re mostly healthier than beer drinkers
D.run a lower risk of diseases than beer drinkers
小題2:According to the passage, beer buyers are less likely to buy ______.
A.cold cutsB.porkC.soft drinksD.vegetables
小題3:The researchers did the study mainly by means of ______.
A.handing out papers with a list of questions
B.collecting receipts from stores
C.watching what customers bought at stores
D.visiting some families throughout the country
小題4:Which of the following is NOT a feature of wine drinkers according to the passage?
A.Rarely eating fats.B.Being in better mental health.
C.Exercising more.D.Having higher education levels.

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


Fred Michel is one of 7.2 million Americans who moonlight, or hold more than one job.
  Once a week, after his day job as medical director of a mental health center, the 40-year-old psychiatrist (精神病大夫) heads to a part-time job at a treatment center for young people. Twice a month, he travels three hours to another teenage treatment center.
  Last year, 5.4 percent of the American workforce held second jobs, according to the US Labor Department, and that looks set to increase this year.
  Many workers like the safety that moonlighting provides, says Carl Hausamn, the writer of "Moonlighting: 148 Great Ways to Make Money to the Side."
  The information from the US Labor Department shows that 40 percent of US moonlighters in 1997 took a second job to meet household expenses or pay off debts. Others save money or buy some special things.
  People also take second jobs with an eye to the future - wanting to try out a new field or gain experience.
  Michel started moonlighting when medical systems were unstable (不穩(wěn)定的). He wanted to make sure he wasn't tied to one system that ended up failing.
  Just as the purposes for moonlighting vary, the moonlighters cross all age and racial groups. And they work in a variety of industries - no longer just service, office and sale jobs.
  “Technology just affects your ability to make money,” Hausman says. "That makes a frequent change in moonlighting."
  As its name means, moonlighting still occurs mostly at night. And that results in some pressures. Chief among them is time.
  Full-time employers could misunderstand, too. Some companies do not allow after-hour work because they fear it will affect their employees' 9-to-5 performance.
  "The primary employer is saying, ‘Wait, I'm paying you for the sharp, fresh, energetic you,’” says Tom Gimbel, president and founder of LaSalle Staffing in Chicago. "If you' re burning yourself at both ends, it's going to show."
  Still, the good done to the moonlighters can be great. Besides extra income, moonlighters enjoy variety, freedom and chance to do something new. They also may find their part-time jobs strengthen what they do full time.
  Besides, "it's fun," Michel says. Not only do his part-time jobs offer a chance to network, stretch his professional skills and make more money, but they also give him the variety he wouldn't find just in a full-time job.
  "It' s a way of pulling from the spice cabinet" he says, "and offering a little variety throughout the day."
60. What is the article mainly about?
  A. The ways of moonlighting.
  B. The reasons for moonlighting.
  C. The problems with moonlighting.
  D. The kinds of people who moonlight.
61. The reason why Fred Michel began to moonlight is that ________.
  A. he found it exciting to do a part-time job
  B. he needed to make ends meet with more money
  C. he feared he would lose his present job one day
  D. he felt more and more pressure from his employer
62. Some companies don't allow their workers to moonlight because they are afraid ________.
  A. their workers can not do extra-hour work for them
  B. their workers will be too tired to try their best at work
  C. their workers will one day turn to some other different jobs
  D. their workers will not get to work and be off work on time
63. The underlined sentence "It's a way of pulling from the spice cabinet." in the last paragraph means _________.
  A. moonlighting gets you away from the job you don' t enjoy
  B. moonlighting offers you freedom to make extra money
  C. moonlighting strengthens your professional skills
D. moonlighting brings you chances to do something different

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


C
Patients and doctors alike have long believed in the healing (治療) power of humor. It is claimed that humor not only affects patients’ moods, but can actually help them recover faster.
Several studies seem to support this. Patients in better spirits are known to have higher immune cell counts. Some have even claimed to have healed themselves of serious illnesses by reading comics and watching comedies.
Despite all this, many researchers are not convinced. They point out the fact that many sufferings have been known to disappear naturally, with or without a daily dose of laughter. They also say that while optimism in general does seem to be related to better health, it is hard to tell which comes first.
Humor in times of stress, however, clearly makes us feel better. On one level, it takes our minds off our troubles and relaxes us. On another, it releases powerful endorphins, a chemical produced by your body that reduces pain.
There are cases where the appreciation of a good joke is indeed directly related to a person’s health. It can show, for example, whether a person has suffered damage to one particular area of the brain: the right frontal lobe (額葉).
Scientists confirmed this by having people read jokes and asking them to choose the funniest endings from a list. Subjects with normal brains usually chose endings that were based on a relatively complex synthesis (綜合) of ideas. Subjects with specifically located brain damage, however, responded only to slapstick (鬧劇) endings, which did not depend on a particular context. When pressed, the brain-damaged subjects saw the logic in the correct endings. They simply did not find them funny.
Of course, humor is largely an individual matter. Next time your friend does not get one of your jokes, there is no need to accuse him of being a lamebrain. However, you might suggest that he lighten up—for the health of it.
63. We can infer from the passage that ________.
A. all researchers have agreed on the healing power of humor
B. people seldom accuse their friends of not understanding jokes
C. the author holds a positive attitude to the healing power of humor
D. reading comics will surely become a popular way of treating diseases
64. Which of the following statements is NOT true?
A. Many researchers are not convinced of the healing power of humor.
B. Patients in bad moods are known to have higher immune cell counts.
C. Optimism in general does seem to be related to better health.
D. People should try their best to cheer up for their good health.
65. Scientists had some people read jokes and asked them to choose the funniest endings from a list to confirm that ________.
A. the brain-damaged people are different from those with normal brains
B. a person with a normal brain usually responds to slapstick endings
C. a person suffering certain brain damage doesn’t appreciate a good joke
D. humor takes our minds off our troubles by releasing powerful endorphins
66. Which would be the best title for the passage?
A. Which comes first, humor or health?             B. Humor can cure different illnesses
C. People need humor in times of stress        D. Humor contributes to good health

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解

A study published Monday found that people who sleep less tend to be fat, and experts said it’s time to find out if more sleep will fight fatness.
“We’ve put so much emphasis on diet and exercise that we've failed to recognize the value of good sleep,” said Fred Turek, a physician at Northwestern University.
Monday’s study from Eastern Virginia Medical School in Norfolk covered 1,000 people and found that total sleep time decreased as body mass index - a measure of weight based on height - increased.
Men slept an average of 27 minutes less than women and overweight and fat patients slept less than patients with normal weights, it said. In general the fatter subjects slept about 1.8 hours a week less than those with normal weights.
“Americans experience insufficient sleep and fat bodies. Clinicians are aware of the burden of fatness on patients,” the study said.
“Our findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index,” it added.
“We caution that this study does not establish a cause-and-effect relationship between restricted sleep and fatness (but) investigations indicating success in weight loss via extensions of sleep would help greatly to set up such a relationship.”
The study was published in the Archives of Internal Medicine along with an editorial by Turek and Northwestern colleague Joseph Bass commenting on it and related research.
In an interview, Turek said some studies have shown sleep causes declines in an appetite suppressing protein hormone, and increases in another hormone that causes a longing for food. In addition neuropathies(神經(jīng)療法)in the brain governing sleep and fatness appear to overlap(重疊), he said.
Patness has been rising dramatically in developed countries and reached epidemic(流行。 levels in the United States, it added, leading to a variety of health problems.
66. What’s the passage mainly about?
A. People who sleep less tend to get fat.
B. Fat people need lots of sleep to lose weight.
C. Sleeping has nothing to do with fatness.
D. Fatness has been rising dramatically in developed countries.
67. According to the passage, which of the following is TRUE?
A. Lack of sleep causes declines in a desire limiting protein hormone.
B. Americans experience sufficient sleep and fat bodies.
C. The findings suggest that major extensions of sleep time may be necessary.
D. Fatness has been rising dramatically in America.
68. Which of the following is NOT close to the underlined word suppress?
A. limit          B. restrict       C. accept         D. control
69. According to the passage, which of the following people is the lowest possible one to get fatness?
A. Americans      B. Chinese        C. Japanese       D. English
70. We can conclude the attitude of the author is           according to the passage.
A. worried        B. uninterested   C. critical       D. optimistic

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


D
The rising costs of health care have become a problem for many countries in the world. To deal with this problem, it is recommended that a big part of the government's health budget be used for health education and disease prevention instead of treatment. Actually, many kinds of diseases are preventable in many ways and preventing a disease is usually much cheaper than treating it. For example, people could avoid catching a cold if they dressed warmly when the weather starts getting cold. But many people get sick because they fail to do so, and have to spend money seeing a doctor.
Daily habits like eating more healthy food would have kept millions of families from becoming bankrupt if the patients had taken measures for early prevention. For instance, keeping a balanced diet, such as not consuming too much animal fat and insuring a steady intake of vegetables and fruits, seems to be quite important.
One very effective and costless way of prevention is regular exercise, which is necessary for a healthy mind and body. Regular exercise, such as running, walking, and playing sports is a good way to make people feel better or reduce stress.
In addition, health education plays a key role in improving people's health. By giving people more information about health, countries could help people understand the importance of disease prevention and ways to achieve it. For example, knowing one's family medical history is an effective way to help keep healthy. Information about health problems among close relatives will make them aware of what they should do to prevent certain diseases through lifestyle changes, which will work before it is too late.
However, stressing disease prevention does not mean medical treatment is unimportant. After all, prevention and treatment are just two different means toward the same effect. In conclusion, we could save money on health care and treat patients more successfully if our country spends more money on health prevention and education.
67.What’s the best title of the passage?
A.Prevention or Education?    B.Prevention or Treatment?
C.Health or Illness?            D.Exercise or Illness?
68.Which of the following can replace the underlined word “bankrupt’’?
A.Unable to be cured        B.Unable to pay one’s debts
C.Stronger than ever before  D.More successful than ever before
69.We learn from the passage that       .
A.dressing warmly can prevent diseases
B.a(chǎn) balanced diet is cheaper than regular exercise
C.the more health education, the better
D.the government’s health budget should be increased
70.Which of the following shows the structure of the passage?

CP (Central Point)  P (Point)        Sp (Sub-point次要點)          C (Conclusion)

查看答案和解析>>

科目:高中英語 來源:不詳 題型:閱讀理解


B
There is an English saying: “l(fā)aughter is best medicine.” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the human body. They have found that laughter really can improve people’s health.
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter had similar effects to physical exercise. It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.
Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programmer. The group that tolerated the pain for the longest time was the groups which listened to a funny programmer. The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain.  
As a result of these discoveries, some doctors in the United States now hold laughter clinics, in which they help to improve their patients’ condition by encouraging them to laugh. They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.
60.Doctors have proved the following EXCEPT that      .
A. smiling does good to health                  B. laughter can be tolerated
C. there is a way to reduce pain                      D. laughter can work the muscles in the feet
61. The main idea of the passage is       .
A. laughter and physical exercise have similar effects on the human body
B. smile can produce the same effects as laughter
C. pain can be reduced by laughter  
D. laughter is the best medicine
62.The underlined word “diminish” is similar to       .
A. test             B. stop                     C. reduce                  D. increase
63. Doctors hold laughter clinics _________.
A. to give better condition to their patients
B. in order to improve patients’ health
C. to make patients smile   
D. to prove smile and laughter have the same effect

查看答案和解析>>

同步練習(xí)冊答案