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【单选题】

Resistance means that a disease carrier ____.

A.
stops responding to medicine
B.
has been treated effectively
C.
has spread from animals to humans
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参考答案:
参考解析:
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举一反三

【单选题】Doctors contribute to the problem of resistance by ____.

A.
ordering antibiotics for patients when the drugs are not necessary
B.
using insecticides when they are not necessary
C.
stopping the use of drugs too soon

【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