The bicycle is one of the simplest and most useful inventions in the world. What is the most surprising is that it was not invented earlier, although the great inventor Leonardo da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced until long after he died.

A person riding a bicycle uses very little energy to make the bicycle move, and there is no pollution at all when you are riding. In Chengdu, a lot of people rode bicycles to work twenty years ago. But cars instead of them now. Even so in developed countries, most people do not travel to work by bicycle. It is not because the bicycles are expensive or people feel tired if they ride to work. It is because the number of cars on the roads is becoming larger. It certainly becomes more dangerous to ride a bicycle. As a result, more people put their bicycles away and go to work in their cars. And in this way, the traffic is very crowded when people go to work by car in the morning and go home after work, the situation is becoming worse and worse.

Perhaps the best way to make riding safer and more popular is to create paths only for bicycles, and to make it so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles. There has been a special way for bicycles on the road in Chengdu now. I think more and more people will return to ride bicycles to go to work. The air of cities will be much fresher. The sky will be a lot bluer. The people will live much happier lives.

54. Who invented the bicycle?

A. Gergy Bush.      B. Mark.      C. Leonardo da Vinci.    D. Harry Borty.

55. The traffic is very crowded ,it is because  ____________________.

A. the roads are becoming larger         B. a number of cars are on the roads 

C. there are many bicycles on the roads    D. lots of people are walking on the roads

56. Why don’t people today go to work by bicycle?

A. Because the bicycle is too expensive.   B. Because it’s very tiring to ride a bicycle.

C. Because the people dislike bicycles.    D. Because it’s very dangerous to ride a bicycle.

57. According to the passage, which of the following is TRUE?

① The bicycles were not produced until long before he died.

② A lot of people in Chengdu rode bicycles to work 20 years ago.

③ It’s not polluted for people to ride bicycles.

④ The people in Chengdu can’t go to work with a special way by bicycle now. 

A. ① ②           B. ② ③          C. ①② ③         D. ② ③ ④

The earth is our home. We must take care of it. Life today is easier than it was        years ago, but it has brought some new problems. One of the biggest problems is pollution（污染）. We can see it, smell it, drink it and even       it. Man has polluted the        . The more people, the more pollution.Many years ago, the problem was not so serious because there were not so       people. When the land was used up (用光), the river was not clean in a place,man went to       place. Now man is slowly polluting the whole world       pollution is still the most serious, it’s bad for       things in the world.Many countries don’t le t people burn       for air in houses and factories in the city. Pollution by SO2 is now the most dangerous kind of       pollution. It’s caused by heavy traffic. People say it’s       to ride bikes. When you are       , there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s not      bikes are expen sive or people are tired if they ride to work. It’s because the number of cars on the roads becomes larger. So more people       their bikes and go to work by cars,  then things are getting       . We should have special roads only for bikes and make it       difficult and expensive for drivers to take their cars into the city that they will go back to use their bikes. 

1.A. hundred       B. hundreds of      C. hundred of      D. hundreds 

2.A. listen         B. listen to         C. hear of        D. hear 

3.A. moon          B. star               C. earth             D. sun 

4.A. lot            B. little             C. many             D. much  

5.A. others        B. the others       C. the other        D. another  

6.A. Air           B. Food              C. Water            D. Noise  

7.A. life           B. live              C. living            D. lives 

8.A. something bad              B. bad something  

C. something good              D. good something 

9.A. water           B. air             C. noise          D. white 

10.A. least           B. best            C. most             D. worst 

11.A. driving       B. biked           C. riding           D. ridden 

12.A. why             B. because          C. what              D. how 

13.A. put on          B. look at         C. put away        D. look up 

14.A. better and better              B. more and more  

C. worse and worse                     D. bigger and bigger 

15.A. quite            B. such              C. very               D. so

　　The earth is our home. We must take care of it. Life today is easier than it was 1 years ago, but it has brought some new problems. One of the biggest problems is pollution(污染). We can see it, smell it, drink it and even hear it.

　　Man has polluted the 2 . The more people, the more pollution. Many years ago, the problem was not so serious because there were not so 3 people. When the land was used up(用光) or the river was not clean in a place, man went to 4 place. Now man is slowly polluting the whole world.

　　 5 pollution is still the most serious, it's bad for 6 things in the world. Many countries don't let people burn(燃烧) 7 for air in houses and factories in the city. Pollution by SO₂ is now the most dangerous kind of air pollution. It's caused by(由……引起) heavy traffic. People say it's 8 to ride bikes. When you are riding, there is no pollution. But even in developed countries, most people don't go to work by bike. It's not because bikes are expensive or people are tired if they ride to work. It's because the number of cars on the roads becomes larger. So more people 9 their bikes and go to work by car, then things are getting worse and worse. We should have Special(特别的) roads only for bikes and make it 10 difficult and expensive for drivers to drive their cars into the city that they will go back to use their bikes.

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