单项选择题

The naturalist walked on for ______ twenty kilometers on an empty stomach.

A．more
B．much more
C．another
D．another more
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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
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
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