Question

【题目】Most animals only have animals of a different kind for food. But sometimes two kinds of animals come together in a partnership (伙伴关系) which is good for them. You may have noticed some birds 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 let the birds do so because they can stop the parasites from troubling them. So though they can do with it by themselves, they can do better together with each other.

Sometimes an animal has a plant partner. The relationship develops until the two partners cannot do without each other. This is so in corals of the sea. Inside their bodies they have very small plants, which act as “cleaners”, taking the useless things from the coral and giving oxygen in return. That is what the animal needs to live. If the plants are killed, or are even kept from receiving light so that they cannot live as usual, the corals will die.

【1】Some birds like to sit on a sheep because ________.

A. they can eat its parasites B. they enjoy traveling with the sheep

C. they can’t live without its parasites D. they want to find the warm place

【2】The underlined(画下划线) word “they” in the first paragraph means _________.

A. birds and parasites B. birds and sheep

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

【3】We learn from the passage that corals need plants for _______.

A. friends B. light C. food D. oxygen

【4】What is the second paragraph mainly about?

A. Some animals and plants cannot live without each other.

B. Some animals and plants cannot develop their friendship easily.

C. Some plants eat each other.

D. Some animals live better together.

Answer 1

【答案】

【1】A

【2】B

【3】D

【4】A

【解析】

短文大意：本文是一篇说明文，介绍了自然界中动植物的关系，说明有的动物和动物之间看似相处的很好，还有的植物和动物是互相依存的关系。

【1】题意：有些鸟喜欢坐在一只绵羊身上，因为 。考查细节理解题。根据This is not because they want a ride, but because they find easy food in the parasites on sheep.，可知选A。

【2】题意：第一段下划线 “they”一词意思是_____。考查词义理解题。根据The sheep let the birds do so because they can stop the parasites from troubling them.，可知they指的是鸟和羊，故选B。

【3】题意：我们从文中得知珊瑚需要植物来 。考查细节理解题。根据第二段句子…taking the useless things from the coral and giving oxygen in return. 和That is what the animal needs to live.可知，珊瑚需要植物提供的氧气才能生存下去，故选D。

【4】题意：第二段主要讲的是什么?考查段意理解题。A. Some animals and plants cannot live without each other. 有些动植物没有彼此就不能生存。B. Some animals and plants cannot develop their friendship easily. 一些动物和植物不容易发展它们的友谊。C. Some plants eat each other. 有些植物会互相吃掉对方。D. Some animals live better together. 有些动物在一起生活得更好。根据第二自然段的内容，结合句子Sometimes an animal has a plant partner.，可知珊瑚和它们体内的植物具有相互依存的关系，故选A。