Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for both of 题目和参考答案——青夏教育精英家教网—

题目内容

Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership (伙伴关系) which is good for both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.

Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals(珊瑚) of the sea. In their skins they have tiny plants which act as “dustmen”, taking some of the waste products from the coral and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they cannot live normally, the corals will die.

1.We learn from the text that corals depend on plants for______.

A. food B. light

C. oxygen D. comfort

2.Some birds like to sit on a sheep because _______.

A. they enjoy travelling with the sheep

B. they can eat the parasites on the sheep

C. they depend on the sheep for existence

D. they find the position most comfortable

3.The underlined word “they” in the first paragraph refers to ____.

A. birds and sheep B. birds and parasites

C. parasites and sheep D. sheep, birds and parasites

4.What does the second paragraph mainly discuss?

A. Some animals live better together.

B. Some plants depend on each other for food.

C. Some animals and plants develop their relationship easily.

D. Some animals and plants depend on each other for existence

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增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。

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