单项选择题

The atmosphere ______ certain gases mixed together in definite proportion.

A．consists of
B．consists in
C．insists on
D．persists in
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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
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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