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【单选题】

____ is spread by coughing.

A.
Polio
B.
Tuberculosis
C.
Malaria
举报
参考答案:
参考解析:
.
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举一反三

【单选题】Diseases can spread quickly ____.

A.
when people live in uncrowded areas
B.
when animal habitats are protected
C.
when people fly from one country to another