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  3. What will man be like in the future—in 5，000 or even 50，000 years from now?We can only make guesses，of course，but we can be sure

What will man be like in the future—in 5，000 or even 50，000 years from now?We can only make guesses，of course，but we can be sure

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问题  What will man be like in the future—in 5，000 or even 50，000 years from now?We can only make guesses，of course，but we can be sure that he will be different from what he is today．For man is slowly changing all the time．
Let us take an obvious example．Man，even five hundred years ago，was shorter than he is to day．Now，on average，men are about three inches taller．Five hundred years is relatively short period of time，so we may assume that man will continue to grow taller．Again，in the modern world we use our brains a great deal．Even so，we still make use of only about 20％of the brain’s capacity．As time goes on，however，we shall have to use our brains more and more，and eventually we shall need larger ones!This is likely to bring about a physical change to the head，in particular the forehead，will grow larger．
   Nowadays our eyes are in constant use．In fact，we use them so much that very often they be．come weaker and we have to wear glasses．But over very long period of time it is likely that man’s eyes will grow stronger．
  On the other hand，we tend to make less use of our arms and legs．These，as a resuh，are likely to grow weaker．At the same time，however，our fingers will grow more sensitive because they are used a great deal in modem life．
  But what about hair?This will probably disappear from the bedy altogether in course of time because it does not serve a useful purpose any longer．In the future，then,both sexes are likely to be bald．
  Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true．All the same，in spite of all these changes，future man will still have a lot in common with use．He will still be a human being，with thoughts and emotions similar to our own．
What serves as the evidence that man is changing?(          )
选项 A、Man has got stronger eyes now than he ever had
B、Man’s hair is getting thinner and thinner
C、Man’s arms and legs have become lighter and weaker
D、Man has been growing taller over the past 500 years
答案D
解析 题目问的是人类外貌逐渐变化的依据。见第二段第二句“Man，even five hundred yearsago was shorter than he is today．”A、B、C均为人类未来的变化趋势而不是人类变化的证据。
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