单项选择题

Most of the butterflies perish in the first frosts of autumn.

A．die
B．disappear
C．migrate
D．vanish
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单项选择题
Many scientists have been probing psychological problems.
A．solving
B．exploring
C．settling
D．handling
单项选择题
It is a complicated problem.
A．strange
B．complex
C．difficult
D．unusual
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