Question

15．For thousands of years，people have used plants to make medicines．They used different parts of the plants-the roots，the leaves，the flowers，and the bark （树皮）．Today，doctors have rediscovered more medicinal values （药用价值） of some plants．Let's look at some examples．
    Foxglove is a common plant．People have used it to make the heart slow down．Recently scientists have developed another drug from it．This new drug helps prevent other heart problems．
    In some areas，malaria has been a problem．Scientists have learned that the bark of a South American tree，the cinchona，can be made into a drug to prevent malaria．For a long time，the Chinese have known that a special plant，wormwood，can also fight malaria．Scientists have been working with it to develop new drugs against malaria．
    In Germany，some scientists studied garlic （大蒜） for four years．They found that it helps prevent the build-up of plaque （血小板） because too much plaque is bad for health．This very common plant continues to be studied．
As we know，there are about 250，000 kinds of flowering plants in the world．Scientists have only studied little more than one percent of plants for their medicinal value．Maybe medicines for AIDS and cancer will be made f rom the other 99 percent．
52．What can foxglove be used for？D
A．Studying plants．
B．Building up the plaque．
C．Treating AIDS and cancer．
D．Preventing heart problems．
53．What does the underline d word"malaria"in Paragraph 3 refer to （指的是）？C
A．A drug．
B．A scientist      
C．An illness．
D．An animal．
54．How many plants are mentioned in the passage？B
A.3．
B.4．
C.5．
D.6
55．Which of the following is the best title for the passage？B
A．Past and future                 
B．Plants and medicine
C．Health and illness               
D．Scientists and doctors．

Answer 1

分析 文章大意：这篇短文主要讲述了一些利用植物防治疾病的知识．

解答 52-55：DCBB
52题答案：D 细节题．根据短文第二段描述This new drug helps prevent other heart problems．可知，毛地黄主要用来防治心脏病，故选D．
53题答案：C 词汇题． 根据第三段下文the cinchona，can be made into a drug to prevent malaria．金鸡纳，可制成药物来预防疟疾 可知这是一种疾病，故选C．
54题答案：B 细节题．根据短文描述，可知主要提到四种植物，Foxglove毛地黄，the cinchona金鸡纳，wormwood艾草和 garlic大蒜．故选B．
55题答案：B 主旨题．根据最后一段Scientists have only studied little more than one percent of plants for their medicinal value．Maybe medicines for AIDS and cancer will be made f rom the other 99 percent．主要讲述了一些草药知识，故选B，植物和医药．

点评 本文是一篇日常生活类阅读，题目涉及多道细节理解题，做题时结合原文和题目有针对 性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．