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举一反三
【单选题】Scientists believe the SARS virus may have originally come from ____.
A.
bats
B.
bats
C.
monkeys
【单选题】One way to control malaria is to ____.
A.
kill the mosquitoes that carry it to humans
B.
treat the monkeys that spread the disease
C.
eat more fruit and vegetables
【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
【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