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
Mark often attempts to escape______ whenever he breaks traffic regulations.
A．having been fined
B．to have been fined
C．being fined
D．to be fined
单项选择题
Doctors sometimes ______old cures when modem medicine doesn't work.
A．fall on
B．fall down on
C．fall back on
D．fall in upon
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