单项选择题

We'll never get to the station on time we run as fast as we can.

A．in case
B．even if
C．provided that
D．if only
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单项选择题
I don't believe in Brown's adventure at all. It sounds so___ .
A．incredible
B．credible
C．incredulous
D．credulous
单项选择题
Does brain power_________ as we get older Scientists now have some surprising answers.
A．descend
B．decline
C．reduce
D．collapse
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