课本片段Passage1

　　课 本 片 段

　　Passage 1

　　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 does good to 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 “dustman”, 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 light so that they cannot live normally, the corals will die.(1996年真题)

　　1. Some birds like to sit on a sheep because ____.

　　A. they can eat its parasites

　　B. they depend on the sheep for existence

　　C. they enjoy traveling with the sheep

　　D. they find the position most comfortable

　　2. The underlined word “they” in the last sentence of the first paragraph refers to ____.

　　A. birds and parasitesB. birds and sheep

　　C. parasites and sheepD. sheep, birds and parasites

　　3. It can be learnt from the text that the coral depends on the plant for ____.

　　A. comfortB. light

　　C. foodD. oxygen

　　4. What does the second paragraph mainly discuss?

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

　　B. Some animals and plants develop their relationship easily.

　　C. Some plants depend on each other for food.

　　D. Some animals live better together.

　　更多高考信息请访问：新浪高考频道 高考论坛 高考博客圈

　　特别说明：由于各方面情况的不断调整与变化，新浪网所提供的所有考试信息仅供参考，敬请考生以权威部门公布的正式信息为准。