It appears that so many Chinese are considering buying a car that one must make a r       in order to get an ideal car timely.

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：閱讀理解

Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.

The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.

Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.

It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(變異) in the gene for melanosome production. This results in less pigmented skin.

However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes.

Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun(太陽光紫外線), which can cause skin cancer.

But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.

Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.

The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.

The passage mainly tells us that ________.

    A. scientists have found out that people’s skin colour is determined by the gene

    B. the new discovery could lead to search into ways to change skin colour safely

    C. pop king Michael Jackson often changed his skin colour as he liked

    D. people can not change their skin colour without any pain

The reason why Europeans are light-skinned is probably that ________.

    A. they are born light-skinned people

    B. light-skinned Europeans have mutation in the gen for melanosome production

    C. they have fewer activities outside

    D. they pay much attention to protecting their skin

It can be inferred from the passage that ________.

    A. nowadays people who want to change their skin colour have to suffer a lot from the damage caused by the chemical treatment

    B. Europeans and Africans have the same gene

    C. the new discovery has helped to find medical treatments for skin cancer

    D. there are two kinds of genes

The writer’s attitude towards the discovery is ________.

A. neutral                          B. negative                   C. positive                    D. indifferent

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Crossing Texas and Mexico, the Big Bend region is high in biodiversity(生物的多樣性). It’s a place so untamed that if something doesn’t bite, stick, or sting, it’s probably a rock.

You know you have arrived in the heart of the Chihuahuan Desert when it feels as if you have fallen off the edge of the earth and into the rabbit hole. Nothing is as it appears. Moths (蛀蟲) are the size of birds. Are those twin pillars (柱) of black rock (a landmark known as Mule Ear Peaks) ten miles (16 kilometers) away or fifty (80 kilometers)? Visibility (能見度) reaches more than a hundred miles on a clear day, and since there are few roads or buildings to use as milestones, distance is difficult to judge.

This is a place where water runs uphill, where rainbows have to wait for rain. The line between myth (虛構(gòu)的故事) and reality is unclear. Stare long enough at the Chisos Mountains or the Sierra del Carmen, the two mountain ranges, known as sky islands, which lie on the land, and they rise and float above the plain.

The vast Chihuahuan Desert is a land of no people. There is always the chance you’ll die of thirst. The “You Can Die”possibilities are endless, and keep some visitors — 350,000 a year to Big Bend National Park, built in 1944 — from coming back. Those who do return are left to think of the remarkable courage of the brave few who have managed to survive in this terrible environment.

The underlined word“untamed”in Paragraph 1 means“________”.

A. untouched                   B. wild                     C. unchanged           D. fresh

Why do the twin pillars of black rock seem ten or fifty miles away?

A. They were put so far away.

B. They lie across the Chihuahuan Desert.

C. It is difficult to judge the distance, with few milestones.

D. One lies in the Chisos Mountains, the other in the Sierra del Carmen.

How many years are there since the Big Bend National Park was built?

A. 350,000 years.          B. 350 years.             C. 66 years.                D. 44 years.

What is the passage mainly about?

A. The natural wonders of the Chihuahuan Desert.

B. Everything you see is not what it seems in the Chihuahuan Desert.

C. The terrible environment of deserts in Texas and Mexico.

D. A special place where none who go can return.

What can we learn from the last paragraph?

A. There are all kinds of living things in the Chihuahuan Desert.

B. No people live in the Big Bend region.

C. Nothing is as it appears in the Big Bend region.

D. Traveling in the Big Bend region is dangerous. 

查看答案和解析>>

科目：高中英語 來源：2012屆廣西桂林市、防城港市高三第一次調(diào)研考試英語卷 題型：完型填空

When I was young, I really doubted whether there was love between my parents．Every day they were busy earning money so that they could   36 the high tuition my brother and I needed．They didn’t   37 in the romantic ways that I read in books or saw on TV．
One day, Mom was sewing a quilt（被子）．I  38 sat down beside her．“Mom, I have a　39 here,” I said after a while．“Is there love between you and Dad?” I asked her in a very 　40 voice．
Mom stopped her work and raised her head with   41 in her eyes．She didn’t answer immediately．She bent her head and continued to sew the quilt．I was   42 if I had hurt her．I was in great embarrassment and I was at a loss what to do．But at last she said, very   43  , “Susan, look at this   44 ．Sometimes it appears, but most of it disappears in the quilt．The thread really makes the quilt strong and lasting．If   45 is a quilt, then love should be a thread．It can hardly be seen, but it’s really there． 46 is inside．”
I listened carefully but I couldn’t understand her until years later．
One day, Dad accidentally got  47 while on duty．Ever since then he could no longer  48
properly．Every morning and dusk Mom would help Dad walk slowly on the country road．Along the country road, there were beautiful flowers, green grass and trees．The leaves were gently glistening   49 the sun shining upon them．All of these made up the most beautiful   50 in the world．
“Dad, how are you feeling now?”” I asked him one day． “Susan, don’t worry shout me,” he said gently． “I just like walking with your mom．I like this kind of life．” Looking into his eyes, I  51 　　what they meant．
The doctor had said Dad would   52  in two months．But that day never came．He   53 away in peace．
54   I thought love meant flowers, gifts and sweet kisses．But from this   55 , I understand that love is just a thread in the quilt of our life, which makes life strong and warm…

【小題1】
A．a(chǎn)ffordB．costC．spendD．offer
【小題2】
A．goB．liveC．a(chǎn)ctD．walk
【小題3】
A．happilyB．silentlyC．secretlyD．nervously
【小題4】
A．requestB．problemC．messageD．question
【小題5】
A．loudB．lightC．lowD．clear
【小題6】
A．surprise B．a(chǎn)ngerC．stressD．horror
【小題7】
A．a(chǎn)mazedB．confusedC．shockedD．a(chǎn)shamed
【小題8】
A．quicklyB．excitedlyC．bitterlyD．gently
【小題9】
A．quiltB．needleC．threadD．sewing
【小題10】
A．beliefB．workC．experienceD．life
【小題11】
A．WarmthB．ThreadC．CottonD．Love
【小題12】
A．tiredB．drunkC．illD．injured
【小題13】
A．talkB．walkC．workD．think
【小題14】
A．withB．a(chǎn)sC．forD．by
【小題15】
A．signsB．symbols C．picturesD．reflections
【小題16】
A．readB．doubtedC．translatedD．recognized
【小題17】
A．retireB．recoverC．regainD．remove
【小題18】
A．passedB．escapedC．fadedD．turned
【小題19】
A．AgainB．OnceC．ThenD．Later
【小題20】
A．lessonB．a(chǎn)ccountC．experienceD．a(chǎn)ccident

查看答案和解析>>

科目：高中英語 來源：2012-2013學(xué)年湖北省荊州中學(xué)高二上學(xué)期期中考試英語試卷（帶解析） 題型：閱讀理解

It may not be news to parents of teenage girls, but researchers have confirmed that no one can stop their 16-year-old daughter from deciding how the family spends its money.
The willpower and determination of teenage girls give them a big say in how a family’s money is spent on everything from food and meals to mobile phones, and, of course, clothes. Teenage boys did not show up at all in the analysis, which was designed to find out the influence of young people on household spending.
The findings on the spending power of teenage girls were calculated from Office for National Statistics records of family spending during the 1980s and 1990s. Researchers examined how much money went on services and leisure goods in different kinds of homes. They checked spending on food, restaurant meals, alcohol, tobacco, services, heating, transport, clothes and sports in 2,745 British families.
They found that teenage girls in the UK typically played an active role in family decisions about the allocation（分配）of household resources. But older children— those over the age of 21 who are still living with their parents—appear to have no say in household decisions.
They also tried to calculate to what extent the bargaining power of a teenager affected family budgets. “Every parent knows that children, even at a very early age, have their own preferences with regard to consumption, researchers said. “But children are only interested in a limited range of goods—mainly sweets and toys—and parents are able to use punishment to reduce their children’s bargaining power or remove it.”  When they become teenagers, however, girls are much more independent and they are capable of earning their own money, which improves their bargaining power in family decisions.
The researchers could not explain why girls have more influence over spending while the evidence for boys is much less conclusive. However, this study could be of great significance to market research and how marketers target children.
【小題1】 From the passage we can learn that            .

A．teenage girls have more influence over family budgets than teenage boys
B．teenage boys don't want to decide on household spending
C．teenage boys have some influence over household
D．teenage girls have weaker willpower and determination than teenage boys
【小題2】What does the underlined part “give them a big say” in the second paragraph mean?
A．Make them dare to say something.
B．Make them want to know.
C．Make them say something meaningful.
D．Make their influence stronger.
【小題3】It appears that household decisions are NOT affected by        .
A．girls living with parents
B．girls over 21
C．girls over 12
D．girls living alone
【小題4】How can parents reduce children’s bargaining power?
A．By persuading them
B．By offering them sweets or toys.
C．By threatening to punish them.
D．By allocating household resources.

查看答案和解析>>

科目：高中英語 來源：2012年人教版高中英語必修五Unit3 練習(xí)卷（解析版） 題型：單項填空

I am quite ______ that the new cosmetics, whether it appears in the form of tablet, capsule, powder or injection, will _______ through the country among young ladies.

A．optimistic about; sweep

B．optimistic ; sweep

C．pessimistic; spread

D．pessimistic about; spread

 

查看答案和解析>>

同步練習(xí)冊答案