第三部分：阅读理解（共20小题；每小题2分，满分40分）
　阅读下列短文，从每题所给的 A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
GENEVA--- The use of stimulants (兴奋剂) or drugs is increasing and something must be done about it, the WHO (World Health Organization) said on Friday.  
In the 1970s the international focus was on heroin. In the 1980s and the 1990s the focus was on cocaine. Now in the 21^st century we are becoming frightened by the rapid increase in amphetamine--type stimulants, not only in the rich countries of the world but the whole world,” said the official of the WHO.
Amphetamines are often used by the workers, such as long-distance truck drivers, to increase endurance(耐久力) or delay sleep, the official said.
About 3 percent of the population of the world use amphetamine, experts said. In Britain, among young people between the ages of 16 and 19, fourteen percent of them have used amphetamine.
In Korea, Japan, Denmark, the Philippines and Australia , amphetamine are more widely used than heroin or cocaine, a reporter said. The problem is also widespread in the United States, Western and Eastern Europe.
56. How many kinds of drugs are mentioned in this passage ?
A. Four     B. Three      C. One     D. Not clear
57. Why does the use of amphetamine-- type stimulants frighten us? 
A. Because the use of it is rapidly increased in the whole world.
B. Because many teenagers in Britain have used it.
C. Because it is dangerous if drivers use it.
D. Because people nowadays don’t use heroin or cocaine but amphetamines.
58. What is the purpose of writing this article?
A. To introduce the problem of using amphetamine in America and Europe.
B. To explain why there are so many people in the world using amphetamine.
C. To tell the history of the use of amphetamine.
D. To pay much attention to the increasing problem of using drugs.