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
It is a complicated problem.
A．strange
B．complex
C．difficult
D．unusual
单项选择题
But ultimately he gave in.
A．undoubtedly
B．certainly
C．finally
D．necessarily
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