【題目】根據(jù)短文理解，選擇正確答案。
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 (伙伴關(guān)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 (寄生蟲) 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）Some birds like to sit on a sheep because _______.
A.they can eat its parasites
B.they enjoy travelling with the sheep
C.they depend on the sheep for existence
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 parasites
B.birds and sheep
C.parasites and sheep
D.sheep, birds and parasites
（3）We learn from the text that corals depend on plants for______.
A.comfort
B.light
C.food
D.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.

【答案】
（1）A
（2）B
（3）D
（4）A
【解析】動(dòng)物與其他不同種類的動(dòng)物之間除了食物鏈的關(guān)系，通常很少有牽連。但是兩種動(dòng)物之間還有可能建立起一種伙伴關(guān)系，從而共生共贏。有時(shí)候動(dòng)物和植物之間也是如此。

⑴A。細(xì)節(jié)理解題。從第一段You may have noticed some birds sitting on the backs of sheep….because they find easy food in the parasites (寄生蟲) on sheep.可以得出答案。

⑵B。猜測詞義題。從第一段倒數(shù)第二和第三得知，羊和羊背上的鳥之間彼此需要。盡管離了彼此一樣能活，但是在一起會(huì)更有利。they是指the sheep和the birds.

⑶D。細(xì)節(jié)理解題。第二段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，珊瑚靠植物供給它賴以呼吸的氧氣。

⑶A。主旨大意題。第二段的首句是本段的主題句，說明動(dòng)物和植物之間也會(huì)有伙伴關(guān)系，并且拿珊瑚和它身上的植物作為例子。故選A。

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