单项选择题

When he lived in Tibet in 1950s, radio was the only means he had to keep of current events in the country.

A．response
B．track
C．record
D．trace
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单项选择题
Cigarette smoking is a great health ______ and may lead to fatal diseases.
A．opposition
B．protagonist
C．fault
D．hazard
单项选择题
After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A．runs away
B．charges for
C．falls off
D．merges into
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