单项选择题

It is one thing to locate oil, but it is quite another to ______ and transport it to the industrial centers.

A．permeate
B．extract
C．distinguish
D．concentrate
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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
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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