2017年pets1公共英语一级阅读理解练习（4）

　　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 eat 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 sometimes 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.

　　1. Bees make ________

　　A silk B fruit C honey

　　2. The story does not say this, but from what we have read, we can tell that________

　　A fruit trees do not need help from insects

　　B praying mantis always lives in a house

　　C some people know nothing about insects

　　3. How many kinds of insects are helpful to people?

　　A I don’t think the story tells us

　　B All kinds C You can count yourself

　　4. The main idea of the whole story is that _________

　　A some insects hurt us and some insects help us

　　B silkworms make silk while bees make honey

　　C farmer like to spray insects in their fields

　　5. A good title for this article could be “_____”

　　A Are all insects harmful?

　　B Which insects are harmful?

　　C Harmful insects