Today some people call Amsterdam the“City of Bicycles”because it is a city which is flat and convenient(方便的)for bicycles.
In the 1960s, a group of cycling fans had an i  46 . They believed that it would be better for everybody if o  47  bicycles were allowed in the city centre. They were hopeful that this would help to save energy, reduce pollution and provide free public transport. The group p  48  hundreds of bicycles white and placed them in public places around Amsterdam for people to use.  A  49  was allowed to take them and use them for short journeys, whether he was a local or a foreigner. Wherever someone finished a journey, they would l  50  the bike there for someone else to use. The problem was that it didn’t work –t  51  took all the bicycles within weeks!
H  52 , more than thirty years later，the“white bike”is back in town---this time with a computer chip(芯片)to r  53  its every move! There is a  54  less traffic in central Amsterdam. Thanks to the good ideas of lots of people, like the cycling fans in the 1960s, many people around the world have been enjoying city centre streets w  55  cars for many years.

Today some people call Amsterdam the“City of Bicycles”because it is a city which is flat and convenient(方便的)for bicycles.

In the 1960s, a group of cycling fans had an i  46  . They believed that it would be better for everybody if o  47   bicycles were allowed in the city centre. They were hopeful that this would help to save energy, reduce pollution and provide free public transport. The group p  48   hundreds of bicycles white and placed them in public places around Amsterdam for people to use.  A  49   was allowed to take them and use them for short journeys, whether he was a local or a foreigner. Wherever someone finished a journey, they would l  50   the bike there for someone else to use. The problem was that it didn’t work –t  51   took all the bicycles within weeks!

H  52  , more than thirty years later，the“white bike”is back in town---this time with a computer chip(芯片)to r  53   its every move! There is a  54   less traffic in central Amsterdam. Thanks to the good ideas of lots of people, like the cycling fans in the 1960s, many people around the world have been enjoying city centre streets w  55   cars for many years.

A person has been badly injured in a car accident. It is necessary to give him a transfusion (输血) because he has lost much blood in the accident. However, special care must be taken in selecting new blood for him. If the blood is too different from his own, the transfusion can kill him.
There are four basic blood groups: A, B, AB and O. A single test can tell us a person’s blood group. Everybody is born with one of these four blood groups. People’s blood group, like hair colour, is inherited (继承) from parents.
Because the substances contained in each group are different, transfusion must be given carefully. Basically, A and B cannot be mixed. A and B cannot receive AB, but AB may receive A or B. O can be given to any other group, so it is often called the universal donor. On the contrary, AB is sometimes called the universal recipient (接受者). However, before being given the transfusion, patients usually receive only salt or plasma (血浆) until their blood can be matched as exactly as possible. In this way, it is possible to avoid any bad results of the transfusion.
There is a relationship between our blood groups and our nationalities. Among the Europeans, about 42 percent are blood group A while 45 percent are blood group O. The rarest is blood group AB. However, some American Indian groups are nearly 100 percent blood group O.
【小题1】Which of the following shows the correct relationship in blood transfusion? (→ =" giving" blood to)

【小题2】Usually, before being given a transfusion, ________.

Everybody can suffer from stress(压力). No matter what your age is, you can feel stressed out by things that are happening in your life. Teenagers, however, have many more opportunities(机会) to get stressed than people in any other age group. Being a teenager is hard. You are not a child any more, but you are not an adult, even though you have to deal with some very grown-up problems and decisions. Families can be one of the biggest causes of stress, such as problems with parents arguing at home, or problems with brothers and sisters. Teenagers also have a lot of stress from school, either from their teachers or from their friends. Some teenagers also feel stressed about choosing their education after high school. Getting a place at university(大学) can be very difficult and some cannot afford to go to university. The stress about getting a job when finishing school is hard for some teenagers. There are so many young people finishing school and not enough jobs for them. Sadly, there is nothing we can do to remove these causes of stress from the 1ives of teenagers, but you can learn the best way to deal with it. Talking to people is one of the best ways to deal with stress. It may sound simple(简单), but it is true. A problem shared is a problem halved(减半).
根据短文内容判断正误，正确的写(A）、错误的写（B）。
【小题1】Being a teenager is often difficult because adults often make them feel stressed.
【小题2】Families can add to the stress a teenager might experience by asking them to go to university.
【小题3】When many teenagers finish school ,they may worry about becoming an adult.
【小题4】Finding a job after finishing school can be difficult because there is a lot of competition for jobs.
【小题5】There are many things we can do to deal with stress.