A.Its resistance to global warming.

　　B.Its ability to pass on the virus frequently.

　　C.Its outbreaks in cities with large populations.

　　D.Its ability to defend itself and resist new drugs.

　　4.It can be inferred from the passage that___________.

　　A.no drugs have been found to treat the disease

　　B.the alternative treatment is not easily available to most people

　　C.malaria has developed its ability to resist parasites

　　D.nobody knows what will be the drug to treat the disease

　　5.Which of the following questions has NOT been discussed in the passage?

　　A.How can we know one is suffering from malaria?

　　B.How many people are killed by malaria each year?

　　C.Why are there so many people suffering from malaria？

　　D.What has been done to keep people unaffected for long？

　　参考答案

　　一、

　　1．解析：it做形式主语。

　　答案：it

　　2．解析：However表示转折。

　　答案：However

　　3．解析：called过去分词短语做定语。

　　答案：called

　　4．解析：gain是动词，后边要求接名词(popularity)做宾语。

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