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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 beca

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

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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 由文章第一段第一句“Everywhere in the world，plant and animals live together。”以及第二段可知，文章的主旨是动植物的共存。A项与文章主旨相符。BCD项均不能表达这个含义，故选A。search or go bagless．”可知，想要进入一些公共场合都要接受检查，除非不带包，故选C。
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