分析 本文是一篇说明文,主要介绍了动物和昆虫是如何通过颜色来保护自己的.有的动物自身的颜色跟周围环境的颜色很像,使猎人很难发现,有的害虫的颜色不同于植物,它们白天躲藏起来,晚上出现,从而避开危险.
解答 51.D 细节理解题 根据It is because locusts change their colors together with the change of the colors of crops(庄稼).描述,可知蝗虫通过改变颜色来保护自己,故选D.
52.C 细节理解题 根据Some other pests with different colors from plants are easily found and eaten by others.So they have to hide themselves for lives and appear only at night.描述,可知有些害虫的颜色不同于植物,它们白天躲藏起来,晚上出现,从而避开危险,故选C.
53.A 细节理解题 根据Bears,lions and other animals move quietly through forests.They cannot be easily seen by hunters (猎人).This is because they have the colors much like the trees.描述,可知熊和狮子能安全生存是因为它们有着和树木很像的颜色,故选A.
54.B 细节理解题 根据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.描述,可知那种鱼能够生存是因为它们喷出的液体能够使它们从对手那里逃生,故选B.
55.C主旨大意题 通过阅读短文,可知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,故选C,颜色对于动物和昆虫的主要用途.
点评 做题时要在理解好文意的基础上,与题目有机的结合,从文章中找到相关细节性的句子与选项细细比对,进行选择或推理判断,选出符合文章内容的正确选项.做题注意灵活,有时可采用排除法或直选法确定出最终答案.
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