分析 本文主要介绍了动物和昆虫是如何通过颜色来保护自己的,昆虫和动物在遇到危险时,他们自身颜色的变化.
解答 51.D.细节题.根据 Some birds like eating locusts (蝗虫),but birds cannot easily catch them.Why?It is because locusts change their colors together with the change of the colors of crops(庄稼)可知那是因为蝗虫可以随着庄稼的颜色变化来改变他们自身的颜色.故选D.
52,C.细节题.根据They have to hide themselves for lives and appear only at night.可知他们不得不白天藏起来,只有在晚上出现.根据句意,选C.
53.A.细节题.根据This is because they have the colors much like the trees.可知这是因为他们有着像树一样的颜色.故选A.
54.B.细节题.根据文章最后一段A kind of fish in the sea can send out a kind of very black liquid (液体)when it faces danger.While the liquid spreads over (散开),its enemies (敌人)cannot find it.And it immediately swims away得知,这种鱼在面临危险的时候会释放黑色的液体,液体散开后,敌人看不见,鱼会迅速的逃跑.故选B.
55.C.主旨题.根据Do you know why different animals or pests (昆虫) have their special colors?Colors in them seem to be used mainly to protect themselves可知这篇文章主要说的是昆虫和动物在遇到危险时,他们自身颜色的变化.颜色对于动物昆虫的主要作用,故选C.
点评 首先要仔细阅读短文,掌握大意,然后结合具体的题目,再读短文找出相关的信息,就可以确定正确答案.
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