单项选择题

The sheer diversity of tropical plants 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
Some social critics took a dim view of the industrialism of the nineteenth century, believing that it ______ a harsh, crude life-style.
A．eradicated
B．facilitated
C．released
D．imagined
单项选择题
I am ______ to Mr. Morrison because of the kindness and concern that he showed me when I first got here.
A．gratified
B．indebted
C．due
D．desirous
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