完形填空
阅读下列短文，从文后各题所给的四个选项中选出一个最佳答案。
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.
| 小题1: | | A．show | B．protect | C．kill | D．interest |
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| 小题2: | | A．easily | B．freely | C．safely | D．differently |
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| 小题3: | | A．sizes | B．smells | C．colors | D．shapes |
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| 小题4: | | A．yellow | B．red | C．black | D．green |
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| 小题6: | | A．different from | B．same as | C．similar to | D．opposite with |
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| 小题7: | | A．other | B．others | C．the others | D．another |
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| 小题8: | | A．in the morning | B．at noon | C．at night | D．in the daytime |
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| 小题9: | | A．study | B．write | C．draw | D．work |
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| 小题10: | | A．them | B．themselves | C．it | D．itself |
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| 小题12: | | A．because | B．so | C．and | D．although |
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| 小题13: | | A．forests | B．desert | C．sea | D．mountains |
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| 小题14: | | A．keep out | B．come out | C．look out | D．give out |
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