请阅读下面短文，根据短文内容从每小题所给的A、B、C、D四个选项中选出最佳选项

　　Chris is not a traditional explorer(探险家)－he usually works in an office for a large organization．However, Chris' job can be just as exciting and dangerous as being an explorer．

　　Chris works for MSF, an organization also known as．Doctors Without Borders．Since1971, MSF has sent trained doctors all over the world to help people who have suffered from disasters(遭受灾难), such as wars and illnesses．Chris is a doctor from France who has traveled to many places to organize programs that help people．

　　At the moment, over 27,000 trained doctors have taken part in MSF projects．The organization received the Nobel Peace Prize in 1999．All kinds of doctors can volunteer for MSF．They need to be ready to go almost anywhere in the world and, of course, they should face difficulties．Most of MSF's work is in Africa．When MSF chooses a doctor for a task, they have to go for at least six months．When doctors have completed a few tasks, they might be sent on an emergency(紧急的)task following a disaster, such as an earthquake．

　　But why would doctors leave a comfortable life and a good pay to join MSF? According to Chris, the experience they have is a great help in their life．What's more, just like the explorers of the past, they need to keep an open mind and learn to get on well with the people they meet．One thing that they can say at the end of any task is that they have made a real difference to people’s lives．

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阅读理解

　　In Singapore, many middle school students spend a lot of their time on their studies．Good education is often regarded as a ticket to success in their future．So many of these students try their best to get a good mark in their examinations．They have a lot of homework every day and exams are a big headache．Sometimes some of them are even made to go to remedial(补习的)classes after school．

　　Schools run programmes outside school hours．The students can take part in sports and games, music and dance, hiking and rock-climbing, etc．They are also very active in community service(社区服务)．

　　In their spare time, most students like to listen to pop music．Hollywood blockbusters(大片)．Hong Kong and Singapore movies are very popular among them．They understand IT very well．Some of them also spend their free time surfing the Internet, e-mailing their friends, playing computer and video games．

　　They sometimes go to cafes, fast-food restaurants, shopping centers and big bookstores．

　　So, it looks like life as a middle school student in Singapore is not easy but it is rich and colorful．

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　　Traveling to work by car gets more expensive today．People can do nothing about the world’s price of petrol(汽油)．They have to go to work, so they have to pay．However, some people are trying to stop driving to work．

　　People are looking for a cheaper means of transportation and they have found out that it is a good choice to ride bikes to work．More and more people return to bikes．

　　Children often go to school by bike．But now businessmen are going to work by bike, too．“The bike is easy to use,” says Molly, “and it is also very cheap．It is a good choice for those who do business like me．You can buy thirty bikes for the price of a small car．A bike doesn’t use expensive petrol．A 10－year－old child can learn to take care of a bike．And most bikes can be used for a long time．”

　　Mr Brown goes to his hospital by bike every day．He says, “A bike doesn’t cost a lot of money, and most families can have two or more ones．Bike riding is good for our health．Today most of people get fat because they don’t get enough exercise．So I tell all my patients to buy bikes．Besides, in big cities it’s usually quicker to travel by bike than by bus or by car．Drivers can’t do anything but get angry when there is a traffic jam”(交通堵塞)

根据短文内容，选择最佳答案。

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根据短文内容选择可以填入空白处的最佳答案。

　　No air means death．Though we 　　1　　 see it, air is around us．　　2　　 air is everywhere and it gives life to every living thing．Without it we can not live．Bad air makes people 　　3　　．We must have fresh 　　4　　 to keep us in good health．

　　In the city there are a lot of people and there are too many 　　5　　 running on the road．The gas which the car sends out(排放)is bad．Every day we breathe it in and 　　6　　．This makes us 　　7　　 sick．So people should 　　8　　 the door as much as they can to get fresh air．There are many factories, too．The chimneys of these factories send out dark smoke．This kind of smoke is dangerous 　　9　　 our health．So in order to(为了)keep us 　　10　　, we have to go to the countryside to breathe more fresh air or we can go up hills to get more fresh air．

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