单项选择题

Scientists cannot ______ the appearance of SARS so far.

A．account on
B．account for
C．account about
D．account with
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单项选择题
The government can't do anything about unemployment because it's too ______ with trying to keep prices down.
A．taken over
B．taken after
C．taken in
D．taken up
单项选择题
The fragrant scent of the lilac is said to ______ the beginning of spring.
A．exult
B．pronounce
C．hasten
D．herald
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