8.In nature,you may see many insects (昆虫)and animals of different colors.Have you ever wondered why?
Locusts(蝗虫) are super delicious food for birds,but it is not always an easy job for birds to catch them.It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies.The reason is that the colors of locusts change with the colors of crops(庄稼).When crops are young,locusts look green.But when autumn comes,locusts change to the yellow and brown color as crops do.Brown bears,tigers and other animals move quietly through forests.They can't be seen easily by their enemies.This is because they have colors similar to the trees.For the same reason,polar bears that live on a land of snow and ice are white.Butterflies and bees living among the flowers are colorful like flowers.Soil insects are mostly dark-colored and they live under the soil in a dark and wet environment.However,insects with colors different from plants can easily be found and eaten by others.So in order to survive,they have to hide themselves in the daytime and appear only at night.
Have you ever noticed some even stranger acts(行为)?The ink fish in the sea can send out some very black ink when it faces danger.As the ink spreads over,its enemies will find themselves suddenly in a dark world.At the same time the ink fish immediately swims away.That is how it keeps itself safe though it is not strong at all.
46.It is not easy for birds to catch locusts becauseD.
A.locusts are good runners
B.locusts can jump very high
C.locusts are smarter than birds
D.locusts can change their color
47.According to the passage,most soil insectsA
A.do not have bright colors
B.change their colors with the soil
C.do not live in a dark and wet environment
D.eat colorful insects like butterflies and bees
48.What's the meaning of the underlined word"survive"in the passage?D
A.繁殖 B.产卵 C.觅食 D.生存
49.The ink fishBso that its enemies will not see it.
A.changes its color
B.makes the water around it black
C.appears only at night
D.hides itself in the sea rocks
50.What is the main idea of this passage?C
A.Some insects and animals have different skills.
B.Some insects and animals are clever than we think.
C.Some insects and animals use colors to protect themselves.
D.Some insects and animals can get used to the environment easily.
分析 文章大意:这是一篇科普知识类遇到,短文主要介绍自然界有许多昆虫和动物都有不同的颜色.本文以蝗虫、棕熊、老虎、北极熊、蝴蝶和土壤昆虫为例叙述了动物的保护色,并且介绍了墨鱼保护自己的方式.
解答 46.答案:D.细节理解题.根据第二段第二行The reason is that the colors of locusts change with the colors of crops(庄稼).原因是蝗虫的颜色随着农作物的颜色而变化.可知,鸟不容易抓到蝗虫是因为蝗虫可以改变它们的颜色.选D.
47.答案:A.细节理解题.根据第二段第五行Soil insects are mostly dark-colored and they live under the soil in a dark and wet environment.土壤昆虫大多是深色的,在黑暗潮湿的环境下生活在土壤下.可知,大多数土壤昆虫没有明亮的颜色.选A.
48.答案:D.词意猜测题.根据上句However,insects with colors different from plants can easily be found and eaten by others.然而,与植物不同颜色的昆虫很容易被其他人发现并吃掉.可知,所以为了"生存",不得不隐藏自己.选D.
49.答案:B.细节理解题.根据最后一段The ink fish in the sea can send out some very black ink when it faces danger.As the ink spreads over,its enemies will find themselves suddenly in a dark world.海里的墨鱼在面临危险时能发出一些极黑的墨水.随着墨水的扩散,它的敌人会突然发现自己在黑暗的世界里.可知,墨鱼使周围的水变黑以便它的敌人不会看到它.选B.
50.答案:C.主旨大意题.根据最后一段The ink fish in the sea can send out some very black ink when it faces danger.海里的墨鱼在面临危险时能发出一些极黑的墨水.That is how it keeps itself safe though it is not strong at all.这是它如何保持自己的安全,虽然它不强.及蝗虫、棕熊、老虎、北极熊、蝴蝶和土壤昆虫,它们利用颜色保护自己的例子可知,短文主要讲一些昆虫和动物用颜色来保护自己.选C.
点评 阅读题型,要注重句子与句子之间、段落与段落之间逻辑关系以及对篇章的整体理解.根据所给问题选择正确选项完成试题.