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

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 es, 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．showB．protectC．killD．interest【小题2】A．easilyB．freelyC．safelyD．differently【小题3】A．sizesB．smellsC．colorsD．shapes【小题4】A．yellowB．redC．blackD．green【小题5】A．soB．asC．likeD．with【小题6】A．different fromB．same asC．similar toD．opposite with【小题7】A．otherB．othersC．the othersD．another【小题8】A．in the morningB．at noonC．at nightD．in the daytime【小题9】A．studyB．writeC．drawD．work【小题10】A．themB．themselvesC．itD．itself【小题11】A．runB．fightC．moveD．eat【小题12】A．becauseB．soC．andD．although【小题13】A．forestsB．desertC．seaD．mountains【小题14】A．keep outB．e outC．look outD．give out【小题15】A．whyB．whenC．howD．whereB