单项选择题

The preservation of natural resources is very important as some raw materials are ______ scarce and limited.

A．primarily
B．sufficiently
C．precisely
D．exceedingly
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单项选择题
Most of us have come to realize that it is about time (that) we ______ effective measures to prevent all kinds of pollution.
A．take
B．took
C．must take
D．shall take
单项选择题
Because of road works, traffic is restricted to one ______ in each direction.
A．lane
B．row
C．alley
D．path
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