15. D。这里别无他人,故他是 say to himself。

A thousand years ago, Hong Kong was covered by a thick forest. As more and more people came to  1  in Hong Kong, these trees were cut down and burnt. Now there is  2  forest left, though there are still some small areas(地方) covered with trees. We call these woods.

Elephants, tigers and many  3  animals were living in the thick forest. When people came to live in Hong Kong, the  4  began to die out. Early farmers grew rice and  5  pigs and chickens in the valleys. They cut down the trees and burnt them. They needed  6  to keep themselves warm in winter, to cook their food and to keep away the dangerous animals. Elephants quickly disappeared(消失) because there was not enough food for them.  7  did most of the wolves and tigers. Monkeys and many other animals soon  8  in the same way.

You might think that there are no longer any animals in Hong Kong  9  in the zoos. There are still about 36 different animals  10  there. One of the most interesting of Hong Kong’s animals is the barking deer. These are beautiful little animals  11  a rich brown coat and a white patch(补丁) under the tail. They look like deer  12  but they are much like a dog  13  . In Hong Kong the barking deer has only a real enemy(敌人)-  14  . People hunt these little animals though it is illegal(违法的). There are now not many barking deer left. So it is important  15  people to protect (保护) wild animals.

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