单选题 Insects live in bushes and grass and trees, in fields and houses and in the ground. Some even live on other animals.
Did you know that there are more insects in the world than any other kind of animal? They fly and hop and crawl and dig. Some insects, the ants, build hills and cities of their own. Insects called silk worms spin silk. Bees make honey. And crickets(蟋蟀) make music with their feet.
Lots of insects grow up in a curious way. When they are little, they look like tiny worms, and most of their lives are spent in just growing. Mosquitoes(蚊子) start this way, and so do beetles(甲虫) and flies, ants and bees. Some caterpillars (毛虫) grow into butterflies. Other wormlike wriggling (蠕动) things become moths (蛾). So all insects do not look the same. Worms in fruit are insects. So are caterpillars and potato beetles, flies and moths.
The things that some insects do are helpful to people. They spin silk and make honey and help the flowers to make seeds. Some insects are pests. They bite and sting (叮) and eat our plants and clothes, food and even furniture. Insects are everywhere.

单选题 Insects live ______.
A. in bushes B. in the ground
C. on some animals D. all of the above

单选题 Which of the following is not true?
A. The number of insects are larger than that of any other kind of animals.
B. Silk worms and bees are useful insects to man.
C. Insects are of no value to people.
D. Insects live in all kinds of ways.

单选题 Which of the following is not true?
A. When they grow up, insects look the same as when they are young.
B. Insects keep changing during their growth.
C. Insects have different shapes.
D. Not all insects look the same.

单选题 Silk worms and bees are ______ , while flies and mosquitoes are ______.
A. beneficial insects... pests
B. pests... beneficial insects
C. harmful to people... helpful to people
D. helpful to people... helpful to people too