单项选择题

The diversity of tropical plants in the region represents a seemingly __________ source of raw materials, of which only a few have been utilized.

A．exploited
B．controversial
C．inexhaustible
D．remarkable
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单项选择题
In the present economic __________ we can make even greater progress than previously.
A．air
B．mood
C．area
D．climate
单项选择题
We should make a clear __________ between 'competent' and 'proficient' for the purposes of our discussion.
A．separation
B．division
C．distinction
D．difference
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