So ____ that no fish can live in it.   

A．the lake is shallow B．shallow the lake is
C．shallow is the lakeD．is the lake shallow

練習冊系列答案
相關(guān)習題

科目：高中英語 來源： 題型：閱讀理解

A

If you and your friends wish to share a secret, you can write it in code, and no one else will be able to read it. Codes are one way of writing in secret. Ciphers (密碼) are another. In a code each word is written as a secret code word or code number. In a cipher each letter is changed.

Codes and ciphers have played an important role in the history of the world. Julius Caesar, the Roman ruler who defeated almost all the countries in Europe about 2, 000 years ago, used a cipher when he sent secret messages to his troops. During the American Revolution, George Washington's spies used a kind of code to send him information about the enemy before his military action. In World War Ⅱ, the Americans "broke", or figured out, Japan's most important naval codes and got enough information to destroy a powerful Japanese fleet(艦隊).

Storekeepers use codes to mark their goods. The codes show how much was paid for the goods or when they were added to the stock. Businessmen use codes to hide plans from their business enemies. Sometimes personal letters or diaries are written in code. Many people enjoy figuring out codes and ciphers simply as a hobby.

In the 16th century, codes and ciphers were very popular among scientists. They wrote messages to each other in code so that no one else would learn their secrets. Geronimo Gardano, an Italian astrologer(占星家), mathematician, and doctor, invented the trellis cipher. He took two sheets of paper and cut exactly the same holes in each one. Then he sent one sheet, which he called a trellis, to a friend and kept the other for himself. Whenever he wanted to write a message, he put his trellis over a clean sheet of paper and wrote the secret message through the holes. Then he removed the trellis and filled the rest of the paper with words that would make sense. When his friend received it, he put his trellis over the writing and read the secret message.

What does the underlined word "trellis"mean?

A. A piece of paper with many small holes.          B. A machine with a lot of small holes.

C. A letter with unreadable words and sentences.   

D. A sheet of paper with groups of Arabic figures.

Which of the following statements is true?

A. Ciphers can be broken or figured out more easily than codes.

B. You could read some words in Geronimo' s letter without his trellis.

C. The first person who ever used a cipher in history was Julius Caesar.

D. Fondness of using codes was the hobby of the scientists in the 16th century.

The best title of this passage is________.

A. Codes and Ciphers                  B. Differences between Codes and Ciphers

C. History of Codes and Ciphers         D. Inventors of Codes and Ciphers

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds;  (2)citrus （柑橘）fruits and tomatoes; (3) potatoes and other fruits and vegetables ; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal (谷物), rice is also in this kind of foods; (7) Butter or something like butter. 

People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways.  People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.

There are two problems, then, in feeding the large number of people on earth. The first thin g is to find some ways to feed the world’s population so that no one is hungry. The second is to make sure that people everywhere have the right kind of food to make them grow to be strong and healthy.

According to the scientists, which of the following groups of food is the healthiest for your lunch?

A. chicken, apples, cereal, cabbages.           B. potatoes, carrots, rice, bread.

C. oranges, bananas, fish, tomatoes.            D. beef, pork, fish, milk

It is important for people to eat __________.

A. three times a day                        B. dinner at twelve o’clock

C. cooked food all the day

D. something from each of the seven kinds of food every day.

People in different countries and different places of the world________________.

A. have the right kinds of food to eat          B. cook their food in the same way

C. have their meals at the same time            D. eat food in different ways.

Which of the following is NOT true?

A. People in some places don’t have enough to eat.

B. There are too many people in the world.

C. One of the problems is that no one is hungry.

D. The scientists are trying to make people e grow to be strong and healthy.

If there is paragraph 4, what do you think is going to be talked about?

A. When people eat their lunch.                 B. What to do with the two problems.

C. How to cook food in different ways.      D. Why people eat different kinds of food. 

查看答案和解析>>

科目：高中英語 來源：黑龍江省牡丹江一中2009-2010學年度高一下學期期中考試英語試題 題型：閱讀理解


Elephants are famous for their supposedly excellent memory. Now it seems that they are good at simple math too.
Researchers at the University of Tokyo have found an Asian elephant named Ashya can add small quantities together and correctly identify(識別）which is larger.
For example ,when researcher Naoko dropped three apples into one bucket and one apple into a second, then four more apples into the first and five into the second, Ashya correctly identified that the first bucket contained more apples and began munching(嚼）on her tasty prize.
Ashya chose the correct bucket 74% of the time "I even get confused when "I'm dropping the apple," Naoko told New Scientist magazine.
Elephants' counting abilities are far from unique. Chimps, pigeons(鴿子)and dolphins have shown the same abilities in lab tests, but what is more impressive for Elephants is that their ability to tell between two figures does not get worse when those numbers are more similar.
The elephants that Naoko tested were as good at telling the difference between five and six as they were at telling between five and one.
Naoko presented her findings last week at the International Society annual meeting in New York.
It is not obvious why elephants should need this mathematical ability in the wild." It is really tough to figure out why elephants would need to count," said Mya, a professor at Cornell University who studies elephants.
One possibility is that they use it to keep track of other members of their herd(獸群）so that no one is left behind. Asian elephants live in groups of six to eight." You really don't want to lose your group members," said Mya.
Another possibility is that the ability for simple math might be a by-product(副產(chǎn)品）of natural selection for a larger brain.
68.The experiments researchers have done recently show that elephants can____.
A. memorize things correctly      B. munch on apples
C. do some simple math          D. change small quantities into larger ones
69.What does the underlined word" tough" in Paragraph 8 mean?
A. Difficult        B. Impossible     C. Easy      D. Useful
70.The reason why elephants need to count is possibly that_____.
A. they want to exercise their brains
B .they often count the members of their herd
C. they hope to stay in groups
D. they have taken regular training

查看答案和解析>>

科目：高中英語 來源：河南省2009-2010學年高一下學期階段測試英語試題（二） 題型：閱讀理解

 

III. 閱讀理解 （ 共20 小題；每小題 2分，滿分40分）

Paragraph 1

Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds. (2) citrus(柑桔) fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal(谷類), rice is also in this kind of food; (7) butter, or something like butter.

Paragraph 2                                                                 

People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw(生的) or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.

Paragraph 3

There are two problems, then, in feeding the large number of people on earth. The first is to find some ways to feed the world’s population so that no one is hungry.

The second is to make sure that people everywhere have the right kinds of food to make them grow to be strong and healthy.

1. According to the scientists, which of the following groups of food is the healthiest for your lunch?

A. chicken, apples, cereal, cabbages                         B. potatoes, carrots, rice, bread

C. oranges, bananas, fish, tomatoes                         D. beef, pork, fish, milk

2. It is important for people to eat _______.

A. three times a day                                                       B. dinner at twelve o’clock

C. cooked food all the day

D. something from each of the seven kinds of food every day

3. People in different countries and different places of the world _______.

A. has the right kinds of food to eat                           B. cooks their food in the same way

C. has their meals at the same time                                   D. eat food in different ways

4. Which of the following is NOT true?

A. People in some places don’t have enough to eat.

B. There are too many people in the world.

C. One of the problems is that no one is hungry.

D. The scientists are trying to make people grow to be strong and healthy.

5. If there is Paragraph 4, what do you think is going to be talked about?

A. When people eat their lunch                                   B. What to do with the two problems

C. How to cook food in different ways                       D. Why people eat different kinds of food

 

查看答案和解析>>

科目：高中英語 來源：2010年普通高等學校招生全國統(tǒng)一考試（重慶卷）英語 題型：單項填空

Today, we will begin____________we stopped yeaterday so that no will be left out.

A．when                            B．where

C．how                             D．what

 

查看答案和解析>>

同步練習冊答案