8．When you do not use your arms or your legs for some time，they will 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 （记忆 ） 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 （过错）．But if he tells us that he has a poor memory，many of us think that his parents may be blamed （责备 ），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 but they have to remember things，they cannot write them down in a small notebook．They have to remember days，names，songs and stories，so their memory is being exercised the whole time．
So if you want to have a good memory，learn from the people：practice remembering things in a way as other people do．
48．Someone can't have a good memory ifC
A．his parents don't have a good memory
B．he can't read or write
C．he doesn't use his memory
D．he doesn't use his arms or legs for some time
49If you do not use your arms or legs for some timeA
A．they become weak and won't become strong until you use them again
B．they will become stronger
C．they become weak but they slowly become strong again
D．you cant use them any more
50．Which of the following is trueB？
A．Your memory works in the different way as your arms or legs．
B．Your memory，like your arms or legs，becomes weak if you do not give it enough chance
to practice．
C．Don't learn how to read or write if you want to have a better memory．
D．A good memory comes from less practice．
51．Few people know that it is onlyD if a friend has a poor memory．
A．his grandmother's fault B．his parents fault
C．his teachers'fault D．his own fault
52．The writer wants to tell usA．
A．how to have a good memory B．how to read and write
C．how to use our arms or legs D．how to learn from the people．
