The diversity of tropical plants in the region represents a seemingly______ sour

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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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