单项选择题

Does brain power ______as we get older Scientists now have some surprising answers.

A．descend
B．decline
C．deduce
D．collapse
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单项选择题
Fool_______Jane is, she could not have done such a thing.
A．who
B．as
C．that
D．like
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Because of the unexpected changes, they postponed ______us an answer.
A．giving
B．have given
C．to give
D．to have given
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