单项选择题

This passage is concerned primarily with the ______.

A．problems of waste disposal
B．dangers of drinking from wells
C．turbidity of polluted water
D．outbreak of cholera
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单项选择题
In developing the main point, the author makes use of ______.
A．scientific arguments
B．convincing testimony
C．common sense observations
D．analogy
单项选择题
The terrorism might have planted a bomb on the plane in Athens, set to ______ when it arrived in New York.
A．get off
B．carry off
C．go off
D．come off
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