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  3. Everywhere in the world, plants and animals live together. Some animals eat plants they live with. Some plants stay alive becaus

Everywhere in the world, plants and animals live together. Some animals eat plants they live with. Some plants stay alive becaus

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问题     Everywhere in the world, plants and animals live together. Some animals eat plants they live with. Some plants stay alive because many plant-eating animals have natural enemies that eat them. Rich soil for the roots of plants is produced by worms and other very small animals that live underground. Green plants feed animals and people.
    It takes all the plants and animals living together to keep the earth a good place to live in. Plants and animals trade with each other. They trade for things they both need to stay alive.
    Animals breathe and the air gets changed inside their bodies. When they breathe the air out again there’s something called carbon(碳)in it. Animals can’t use this air again. But plants need carbon. The plants trade fresh air for the carbon they need.
    Plants make food from carbon and water. They use sunlight for this work, just as a machine uses gas or electricity to keep running. The plants store the food they make inside themselves.
    But what do the plants get in return? Many things. Plants make food from the carbon and other things that come from animals’ bodies. Insects like bees carry pollen(花粉)from one flower to another and the pollen forms seeds. Birds and other animals eat the fruit in which seeds grow and often drop the seeds where they can grow up into new plants. So animals help the growth of new plants.
What is the main idea of the text?
选项 A、Living things are connected in nature.
B、Some animals stay in plants for safety.
C、Animals and plants are of different types.
D、Some plants can stay alive by themselves.
答案A
解析 归纳题。题于意为“文章的中心思想是什么?”全文基本可以分成两个部分。第一部分说明一些动物靠食草为生，植物为动物提供了生存养料。第二部分说明植物也可以借助动物获取一定的生存养料。所以两者是相辅相成的。故A正确。
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