第4部分：阅读理解(第31～45题，每题3分，共45分)

　　每道题后面都有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。

　　Natural Medicines

　　Since earliest days, humans have used some kinds of medicines. We know this because humans have survived. Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.

　　They were successful long before the time of modern medicine. Before the time of doctors with white coats and shiny (发亮的) instruments. Before the time of big hospitals with strange and wonderful equipment.

　　Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals. Yet injuries are treated. And diseases are often cured. How? By ancient methods. By medicines that might seem mysterious, even magical (有魔力的). Traditional medicines are neither mysterious nor magical, however.

　　Through the centuries, tribal (部落的) medicine men experimented with plants. They found many useful chemicals in the plants. And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.

　　Experts say almost 80% of the people in the world use plants for health care. These natural medicines are used not just because people have no other form of treatment. They are used because people trust them. In developed areas, few people think about the source of the medicines they buy in a store. Yet many widely-used medicines are from ancient sources, especially plants. Some experts say more than 25% of modern medicines come, in one way or another, from nature.

　　Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive. So scientists' interest in traditional medicine is not new. But it has become an urgent concern. This is because the earth's supply of natural medicines may be dropping rapidly.

　　1 The passage indicates that ancient treatments for injury and disease were__________.

　　A much more successful than modem ones.

　　B successful enough for humans to survive.

　　C successful in all cases.

　　D of little help to humans.

　　2 Which of the following statements is NOT true?

　　A Modern medicines are now available all over the world.

　　B Many big and modem hospitals are expensive.

　　C Traditional medicines are neither mysterious nor magical.

　　D Humans have used some kinds of medicines since earliest days.

　　3 It is believed by scientists that traditional medicines__________.

　　A can cure all kinds of diseases.

　　B may cure some of today's most serious diseases

　　C are no longer useful for modem men.

　　D are too cheap to be useful.

　　4 What do the majority of the people in the world use for health care?

　　A Strange and wonderful equipment.

　　B Factory-produced chemicals.

　　C Modern medicines.

　　D Plants.

　　5 It can be seen from the passage that the earth's supply of natural medicines__________.

　　A may never be exhausted.

　　B may be dropping rapidly.

　　C is surprisingly big.

　　D is as rich as ever.