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Millions of people are in danger of getting malaria because______.

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Millions of people are in danger of getting malaria because______.

A. some countries have not started a campaign against mosquitoes

B. new species of mosquitoes may survive today's sprays

C. malaria was once thought to be a very old evil of the world

D. present sprays are not as effective as people think

参考答案:

B[解析] 见第二段最后一句话。

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