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One reason for malaria to be more widespread now is that______.
A.more people have moved to malaria-infected areas
B.mosquitoes have become resistant to pesticides
C.genetically modified mosquitoes still transmit the disease
D.mosquitoes bite as many as 500 million people a year

A.
A.more
B.mosquitoes
C.genetically
D.mosquitoes

【参考答案】

B
在Excerpt2讲到,科学家希望使蚊子不能传播疾病来消除疟疾。后面讲到“becauseofdrugresistanceandpopulationchanges,malariaisactuallymoreprevalentnowthanitwas20yearsago.”由于蚊子的抗药性和...

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