Do you know why different animals or pests(害虫) have their special colors? Colors in them seem to be mainly used to    1   themselves.

Some birds like eating locusts(蝗虫), but birds cannot    2  catch them. Why? It is because locusts change their   3   with the change of the colors of crops. When crops are green, locusts look    4 . But as the harvest time comes, locusts change into the same brown color    5  crops have. Some other pests whose colors are   6   plants are easily found and eaten by   7  . So they have to hide themselves for lives and appear only   8  .

If you    9 animals’ life, you’ll find the main use of colors is to protect    10  . Bears, lions and other animals  11  quietly through forests. They cannot be easily seen by hunters   12  their colors are much like the trees.

Colors are useful not only on the land, but also in the   13 . A kind of fish can   14  a kind of black liquid(液体) when they face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is   15  they can live safely though they are not strong at all. So colors are really useful to animals.

1.                A．show          B．protect         C．kill  D．interest

2.                A．easily          B．freely          C．safely    D．differently

3.                A．sizes           B．smells          C．colors    D．shapes

4.                A．yellow         B．red            C．black D．green

5.                A．so             B．as             C．like  D．with

6.                A．different from   B．same as         C．similar to  D．opposite with

7.                A．other          B．others          C．the others D．another

8.                A．in the morning   B．at noon         C．at night   D．in the daytime

9.                A．study          B．write           C．draw D．work

10.               A．them          B．themselves      C．it D．itself

11.               A．run            B．fight           C．move D．eat

12.               A．because        B．so             C．and  D．although

13.               A．forests         B．desert         C．sea   D．mountains

14.               A．keep out       B．come out       C．look out   D．give out

15.               A．why           B．when          C．how  D．where

We live in “computer age(时代)”. People like using computers to do ___21__work. But more than 20 years ago, ___22__couldn’t do much. They were very big and expensive. Very __23___people were interested in them and knew how to use them. Today computers are smaller and ___24___.Since they are useful, many people like to use them, even at home.
Computers ___25___very important because they can work ___26___than men and make fewer mistakes. Computers can ____27___people do a lot of work. Writers can use computers to write. Teachers can use computers to help teaching and students use them to study. Computers can also remember what you put ___28____ them. Computers are very___29___. They are our good friends. Do you want to ___30____a computer.

 We live in computer age (时代). People         scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago,         couldn't do much. They were very big and expensive. Very        people were interested in them and knew how to use them. Today computers are smaller and       , but they can do     work than before. Many people like to use them. Some people even have them at home.

  Computers become very important because they can work         than people and make fewer mistakes. Computers can        people do a lot of work. Writers now use computers to        . Teachers use them to help teaching. Students use them to         . Computers can also remember what you          them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

1.A. like          B. as              C. and              D. with

2.A. students    B. scientists    C. teachers         D. computers   

3.A. few          B. a few          C. little             D. a little

4.A. cheap       B. cheaper       C. more expensive   D. expensive

5.A. much        B. many         C. more            D. less

6.A. fast         B. faster         C. slow              D. slower

7.A. help         B. make          C. stop              D. use

8.A. write        B. play           C. study            D. learn

9.A. sing         B. study          C. dance           D. watch

10.A. put in    B. put on         C. put into        D. put up

We live in computer age (时代). People    1    scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago,    2    couldn't do much. They were very big and expensive. Very    3    people were interested in them and knew how to use them. Today computers are smaller and    4    . But they can do a lot of work, many people like to use them. Some people    5    have them at home.

Computers become very important because they can work    6    than people and make fewer mistakes. Computers can    7    people do a lot of work. Writers now use computers to    8    . Teachers use them to help teaching. Students use them to    9    . Computers can also remember what you    10    them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

1.A. like B. as C. and D. with

2.A. students B. scientists C. teachers D. computers

3. A. few B. a few C. little D. a little

4.A. cheap B. cheaper C. more expensive D. expensive

5. A. even B. still C. already D. yet

6. A. fast B. faster C. slow D. slower

7.A. help B. make C. stop D. use

8. A. write B. play C. study D. learn

9.A. sing B. study C. dance D. watch

10. A. put in B. put on C. put into D. put up

We live in computer age (时代). People    1    scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago,    2    couldn't do much. They were very big and expensive. Very    3    people were interested in them and knew how to use them. Today computers are smaller and    4    . But they can do a lot of work, many people like to use them. Some people    5    have them at home.

Computers become very important because they can work    6    than people and make fewer mistakes. Computers can    7    people do a lot of work. Writers now use computers to    8    . Teachers use them to help teaching. Students use them to    9    . Computers can also remember what you    10    them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

1.A. like B. as C. and D. with

2.A. students B. scientists C. teachers D. computers

3. A. few B. a few C. little D. a little

4.A. cheap B. cheaper C. more expensive D. expensive

5. A. even B. still C. already D. yet

6. A. fast B. faster C. slow D. slower

7.A. help B. make C. stop D. use

8. A. write B. play C. study D. learn

9.A. sing B. study C. dance D. watch

10. A. put in B. put on C. put into D. put up