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  3. Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however,

Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however,

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问题     Most of the 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 them. You may see some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in me parasites (寄生虫) on sheep. The sheep allow the birds to do so because they can remove the cause of discomfort. So although mey can live without each other, they do better together.
    Sometimes an animal has a plant partner. The relationship develops until the two partners cannot live without each other. This is so in me corals(珊瑚)of the sea. In their skins mere are tiny plants which act as "dustmen" , taking some of the waste products from me corals and giving in return oxygen(氧气) 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.
We learn from the text that corals depend on plants for______.
选项 A、comfort
B、light
C、food
D、oxygen
答案D
解析 从文章第二段第四句“In their skins…giving in retum oxygen which the animal needs to breathe．”可知，植物为动物提供了生活必须的氧气。故正确的答案为D。
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