高一英语同步课程
《完形填空之词语辨析》麻雪玲
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教学生举一反三
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为学生推送同类型题，掌握解题方法
What will man be like in the future-in 5000 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 today. 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.
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