A thousand years ago Hong Kong was covered by a thick forest. As more and more people came to 　31　 in Hong Kong, these trees were cut down and burnt. Now there is　32　 forest left, though there are still some small areas covered with trees. We call these woods.
　　Elephants, tigers and many　33　 animals were living in the thick forest. When people came to live in Hong Kong, the　34　 began to die out. Early farmers grew rice and　35　 pigs and chickens in the valleys. They cut down the trees and burnt them. They needed　36　 to keep themselves warm in winter, to cook their food and to keep away the dangerous animals. Elephants quickly disappeared because there was not enough food for them. 　37　 did most of the wolves and tigers. Monkeys and many other animals soon　38　 in the same way.
　　You might think that there are no longer any animals in Hong Kong　39　 in the zoos. But there are still about 36 different animals　40　 there. One of the most interesting of Hong Kong's animals is the barking deer. These are beautiful little animals　41　 a rich brown coat and a white patch (补丁) under the tail. They look like deer but they are much smaller. They are less than two feet　42　. They make a noise rather like a dog　43　. In Hong Kong the barking deer has only a real enemy--　44　. People hunt these little animals though it is illegal (违法的). There are now not many barking deer left. So it is important　45　 people to protect wild animals.

When are you an adult (成年人)？
When do you think you are an adult ? Maybe different __31_ have different ideas.
Now let’s see what some American teenagers(青少年)say .
Sam: In  32 idea ,you are an adult at the  33  of 18. That’s when you can vote(投票)。You can help to   34  who rules(统治)the whole country .That’s also a grown-up does! My grandfather couldn’ t vote   35 he was 21.They changed（改变） it to 18 in 1971.
Jenny：I don’t 36  it’s hard to say . I can drive a car at 16, can’t I ?When you have a driver’s licence , you can 37 it to people to tell them your age for all kinds of things .  38    sixteen must be the age when you change from a  39  person to an adult.Because you can tell others you are not a  40   any more .
Suzie : Well , I think there is  41   wrong with American laws for when young people can  42  things . I can vote at 18 and drive at 16. So you would think 18 is a grown-up,  43  16 isn’t .But then I can’t drink wine（酒）until I’m 21 ! If I’m 44   an adult at 18, how can people stop me from  45   a cup of beer in a bar ?