阅读理解。 If you don't use your arms or your legs for some time, they will become weak; when you start using them again, they will gradually (逐渐地) become stronger again. Everybody knows this. Yet many people do not seem to know that it is the same with our memory. 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 (责怪), 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 they usually have better memories? This is because they can not read or write and they have to remember things; they can not write them down in a little notebook. They must remember dates, names, songs and stories; so their memories are being exercised the whole time. So if you want a good memory, learn from these people: practice remembering. 1. What will happen to your arms or legs if you don't use them for some time? They will be ______. [     ] A. strong B. broken C. weak D. hurt 2. What does the word 'fault' mean in the second paragraph? [     ] A. 困难 B. 过错 C. 粗心 D. 聪明 3. What do many of us think of the person with a poor memory? [     ] A. His parents are to blame. B. He isn't clever. C. He is foolish. D. His parents are very clever. 4. Why do some people usually have better memories but they can't read or write? Because ______. [     ] A. they are stronger B. they often practice remembering things C. they have strong arms and legs D. their parents are good 5. What does the passage mainly (主要) talk about? [     ] A. Arms. B. Legs. C. Behaviors. D. Memories.