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

Many people are ______ to insect bites, and some even have to go to hospital.

A. insensitive
B. allergic
C. sensible
D. infected

单项选择题

Although he has become rich, he is still very（）of his money.

A. economic
B. thrifty
C. frugal
D. careful

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