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  3. We often think that insects are harmful. This isn’t true really. Farmers are fighting against insects most of the time. Hungry i

We often think that insects are harmful. This isn’t true really. Farmers are fighting against insects most of the time. Hungry i

admin2009-07-17  113
问题 We often think that insects are harmful. This isn’t true really. Farmers are fighting against insects most of the time. Hungry insects kill plants in the fields. Farmers spray (喷洒农药) the fields to kill these insects. Does this mean that all insects are harmful? No. Many are of great help to man. Bees make honey. Without bees and other insects, many trees would have no fruit. Silkworms (蚕) make silk. Some insects eat other insects that kill fruit trees. Have you ever seen a praying mantis (螳螂)? People who do not know about the praying mantis some- times hate it. They think it is harmful. But this insect is of great help to farmers. It eats insects that kill plants.
Long ago, many people thought most insects are enemies. Today, we know the difference between harmful insects and those that help us.
选项 A、silk
B、fruit
C、honey
答案C
解析 蜜蜂产花蜜。
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