单项选择题

If you do not use your arms or your legs for some time, they become weak. When you (36) . using them again, they (37) become strong again. Everybody knows this and nobody would think of (38) this fact. (39) there are many people who do not (40) to know that memory works in the (41) way.
(42) someone says that he has a good memory; he (43) means that he (44) his memory by practising exercising it. When someone (45) says that his memory is poor, he actually means that he (46) give it enough chances to become (47) . Have you ever (48) that people who cannot read or write usually have (49) memories than those who can This is (50) those who (51) read or write (52) remember things. They have to remember dates, places, names, songs and stories. So their memory is the whole time (53) . So (54) you want to have a good memory, you should learn from those people, (55) by remembering what you see, hear, feel and write. If so, you must have a good memory.

55().

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