组卷网 > 初中英语综合库 > 主题 > 人与自然 > 动物与植物 > 常见动物
题型:完形填空 难度:0.65 引用次数:250 题号:11425698

Do you know why different animals or pests (害虫) have their special colours?

Colours in them seem to be used mainly to protect themselves.

Some birds like eating locusts (蚱蜢), but birds cannot ________ catch them. Why? It is because locusts change their colours with the change of the colours of crops. ________ crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown colour ________ crops have. Some other pests with different colours from plants are easily ________ and eaten by others. So they have to hide ________ for lives and appear only at night.

If you study the animal life, you’ll find the main ________ of colours is protecting themselves. Bears, lions and other animals move quietly ________ forests. They cannot be easily seen by hunters. This is ________ they have the colours much like the trees.

Have you ever watched a much more strange act? A kind of fish in the sea ________ send out a kind of very black liquid when it faces danger. When the liquid spreads over, its enemies cannot find it. And it immediately swims away. So it has lived until now though it isn’t ________ at all.

1.
A.easilyB.clearlyC.freelyD.safely
2.
A.UntilB.WhenC.ButD.Although
3.
A.withB.fromC.asD.in
4.
A.changedB.foundC.savedD.left
5.
A.themB.itC.themselvesD.itself
6.
A.useB.differenceC.ideaD.danger
7.
A.acrossB.fromC.throughD.over
8.
A.unlessB.thatC.becauseD.since
9.
A.mustB.shouldC.needD.can
10.
A.heavyB.lovelyC.beautifulD.strong
【知识点】 常见动物 科普知识

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A.learnB.giveC.haveD.take
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A.peopleB.animalsC.studentsD.family
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A.timeB.moneyC.lifeD.face
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