One reason for malaria to be widespread now is that ______ Lanzaro is confident that scientists can block transmission of malar

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问题 One reason for malaria to be widespread now is that ______
Lanzaro is confident that scientists can block transmission of malaria to humans because ______

选项 A、natural mosquito populations do not change
B、scientists have succeeded with birds and mice
C、foreign genes always go where they are required
D、lab-raised mosquitoes will not be resistant to drugs

答案B

解析 参见第47题解释。
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