多项选择题

The sheer diversity of tropical plants represents a seemingly ______ source of raw materials, of which only a few have been utilized.

A. exploited
B. quantifiable
C. controversial
D. inexhaustible
E. remarkable
F. infinite
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单项选择题
We realized that John was still young and impressionable, but were nevertheless surprised at his ______.
A. naivete
B. obstinateness
C. decisiveness
D. ingeniousness
E. resolve
单项选择题
The self-important cant of musicologists on record jackets often suggests that true appreciation of the music is an ______ process closed to the uninitiated listener, however enthusiastic.
A. unreliable
B. arcane
C. arrogant
D. elementary
E. intuitive
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