问题详情：
If you do not use your arm or your legs for some time, they become weak; when you start using them again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory is poor, he really means that he does not give it enough chance to become strong. If a friend says that his arms and legs are weak, we know that it is his own fault. But if he tells us that he has a poor memory, many of us think that his parents are to blame, and few of us know that it is just his own fault. Have you ever found that some people can't read or write but usually they have better memories? This is because they cannot read or write and they have to remember things; they cannot write down in a little notebook. They have to remember days, names, songs and stories; so their memory is the whole time being exercised. So if you want to have a good memory, learn from the people: Practice remembering.
49. The main reason for one who has a poor memory is that__________.
A．his father or mother may have a poor memory
B．he does not use his arms or legs for some time
C．his memory is not often used
D．he can't read or write
50. If you do not use your arms or legs for some time __________.
A．you can't use them any more
B．they will become stronger
C．they will become neither stronger nor weaker
D．they become weak and won't become strong until you use them again
51. Which of the following is NOT true?
A．Don't learn how to read and write if you want to have a better memory.
B．Your memory, like your arms or legs, becomes weak if you don't give it enough chance for practice.
C．Your memory works in the same way as your arms or legs.
D．A good memory comes from more practice.
52 Which is the best title for this passage?
A．Don't Stop Using Your Arms Or Legs
B．Learn From the People
C．strong Arms And Good Memories
D．How To Have a Good Memory
【回答】
CDAD
知识点：健康保健类阅读
题型：阅读理解
