题目内容
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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.
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完形填空（1分X10=10分）
Three small fish lived in the sea. When they were very young, their parents died. They had to 1_______ each other day after day. Finally, they grew up and 2_________ to swim deeper and further.
One morning, the three fish were 3_________ to a shallow(浅滩) water by a big wave. A small boat was taken there, too. It was hard for the fish to go back to the sea because the boat was right in front of them. The largest fish realized that they were 4________ and said they had to find a way to leave there as fast as possible. The second largest fish 5________ with his elder brother, but the youngest one did not. He said that there was much 6_________ for their activities, so he would not worry at all and still swam around 7_________. At last, the largest fish returned to the 8_______ by jumping over the lowest part of the boat. The second largest fish also succeeded in 9_________ his elder brother in the other side of water. But the youngest one didn’t follow them and still swam joyfully.
Two hours later, when the 10________ rose up, the water in the small shallow corner dried up. The fish who did not try to return to the sea died of lack(缺少) of water.
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