长期以来，AST被认为是治疗哮喘速效药中最有效的一种。然而，1988年在X地区所进行的研究发现，在被观察的哮喘病人中，有
的人在服用该药后产生了严重的副作用。一些医生据此认为，应该禁止使用AST作为治疗哮喘的药物。以下哪项如果为真，最严重地削弱了上述观点（）
A．在AST最常用于治疗哮喘的X地区，由哮喘而导致死亡的人数近几年增加了
B．在被观察的那些服用AST的病人中，许多人以前从未服过这种药
C．尽管AST的副作用越来越受关注，X地区的许多医生仍然给哮喘患者开这种药
D．在被观察的那些服用AST的病人中，只有那些胆固醇含量极高的患者服用后才产生副作用
参考答案：D
| 阅读短文，把方框中的选项还原到短文中，使短文完整、通顺，然后为第5题选择正确选项。 | |
| Fire can help people in many ways. But it can also be very harmful. Fire can heat water, warm your houses, give light, and cook food. 1. It can burn trees, houses, animals, or people. Sometimes big fires can burn forests. Nobody knows for sure (确实) how people began to use fire. But there are many interesting old stories about the first time a man or woman started a fire. One story from Australia tells about a man very, very long time ago. 2. Today people know how to make a fire with matches. Children sometimes like to play with them. But matches can be very dangerous. One match can burn a piece of paper, 3. A small fire can become a big fire very fast. Fires kill many people every year. So you must be careful with matches. 4. Fires need oxygen. Without oxygen they die. There is oxygen in the air. Cover a fire with water, sand, or in an emergency (紧急情况), with your coat or something else. This keeps the air away from a fire and kills it.
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| 5. Which of the following is NOT talked about in the passage? | |
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| A. Fire can be used to heat water. B. Fire can be used to warm our houses. C. Fire can be used to cook food. D. Fire can be used to dry our clothes. |