单项选择题

Acute hearing helps most animals sense the approach of thunderstorms long before people_______.

A．do
B．hear
C．do them
D．hearing it
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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
单项选择题
A．makeB．printC．performD．produce
A．make
B．print
C．perform
D．produce
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