单项选择题

No one could come up with an easy solution to the government' s predicament—labor ______. which is caused by the wars.

A．decline
B．vacancy
C．rarity
D．shortage
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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
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
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