A．take some medicine with you B．clean the cover

C．drink much water D．wear warm clothes

　　38．You had better not______ while you are having a trip.

A．wear glasses B．be too tired

C．wear a hat D．take a rest

　　39．If you ______while traveling，your trip will be happier.

　　　　A．walk fast B．eat too much

C . keep healthy D．climb a mountain

　　40．The passage mainly talks about______.

A．traveling development B．how to keep healthy during a trip

C．activities before traveling D．activities while traveling

We each have a memory（记忆力. That's why we can still remember things after a long time. Some people have very good memories and they can easily learn many things by heart, but some people can only remember things when they say or do the again and again. Many of the great men of the world have got surprising memories. A good memory is a great help in learning languages. Everybody learns his mother language when he is a small child. He hears the sounds, remembers them and then he learns to speak. Some children are living with their parents in foreign countries. They can learn two languages as easily as one because they hear， remember and speak two languages every day. In school it is not so easy to learn a foreign language because the pupils have so little time for it, and they are busy with other subjects, too.

But your memory will become better and better when you do more and more exercises.

41. Some people can easily learn many things by heart because __________ .

A. they always sleep well B. they often eat good foot

C. they read a lot of books D. they have very good memories

42. Everybody learns his mother language __________ .

A. at the age of six B. when he is a small child

C. after he goes to school D. when he can read and write

43. Before a child can speak, he must __________ .

A. read and write B. make sentences