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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.
What does the second paragraph mainly discuss?
选项 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A
解析 从文章第二段最后两句“In their skins…needs to breathe． If the plants are killed…the corals will die．”说明了动物和植物之间相互依赖的生存关系。故正确的答案为A。
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