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Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually．

A． that B． where C． which D． whose

解析:

略

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Waste analysis might make a huge difference when wild species are accused of attacking domestic livestock （家畜）． Hurt says, “A good detection dog will find the waste so we can see what the animal is actually eating．” This may help reduce problems between people and wildlife．

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What will man be like in the future? We can only make a guess, but we can be sure that he will be different from what he is today.

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 too 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 become weak and we have to wear glasses. But over a very long period 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 result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.

But what about hair? It will probably disappear from the body altogether in the course of time because it does not serve a useful purpose any longer. In the future, both sexes are likely to be bald（禿的）.

Perhaps all these give the impression that future man will not be attractive creature to look at! This may well be true. All the same, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.

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	Brain	We’re using twenty percent of our brains at present. With the increasing use in the future, our brains may eventually become ____.
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	Fingers	Fingers will become more sensitive due to the constant use.
	Hair	Hair will probably _______from the body. It is possible that both males and females are bald in the future.
Future man may look ______, but he will still have thoughts and emotions similar to ours.