The diversity of tropical plants in the region represents a seemingly______source of raw materials, of which only a few have bee

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

选项 A、exploited
B、controversial
C、inexhaustible
D、remarkable

答案C

解析 从句意尤其是后半句,可知此题应选C,表示“用不完的,用之不竭的”,如:an inexhaustible supply of coal(用之不竭的煤炭供应)。A项(被开采的,被开发的)、B项(争论的,争议的)和D项(不平常的,非凡的,显著的)均不合适。
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