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Some animals sleep during _____ day.

A．the             B．a              C．an              D．\

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　　Insects protect themselves in many ways. Some have thick skins or shells. Others are protected by the cocoons (繭) in which they sleep. There are still others, which use stingers to ward off their enemies. There are even insects that discourage their enemies from attacking them because they have an awful smell.

　　The thing that almost all insects use for protection is their ability to disappear. They don't really vanish, but they camouflage themselves so that they can't be seen.

　　Some try to look like the twigs of the trees on which they sit. Others try to look like those insects that taste bad when eaten.

　　Most insects change their appearance when they sleep during the day. They do this in order to defend themselves from birds, snakes, and other predators (食肉動物) who think that insects might make a fine meal

1．Almost all insects protect themselves by making ________.

[　　]

A．themselves hard to see

B．themselves foul smelling

C．use of their thick skins or shells

D．use of their sting

2．The main idea in the first paragraph is that insects ________.

[　　]

A．are very different from other creatures

B．fight very hard to survive

C．have all kinds of enemies

D．use various means to defend themselves

3．The underlined word “camouflage” means ________.

A．run away from where they are

B．cover themselves in a cocoon

C．find new places to hide

D．disguise their appearance

4．Insects are most likely to change their appearance when they ________.

[　　]

5．The purpose of this passage is to ________.

[　　]

A．tell the reader why insects are in danger

B．explain the life cycle of insects

C．show that insects are able to attack bigger animals

D．describe the behavior of insects