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  3. The sheer diversity of tropical plants represents a seemingly______source of raw materials, of which only a few have been utiliz

The sheer diversity of tropical plants represents a seemingly______source of raw materials, of which only a few have been utiliz

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问题 The sheer diversity of tropical plants 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 形容词词义辨析。空格填入一个形容词，表示对原材料资源的修饰，并且和热带植物有关。represents表达前后因果关系，所以空格要表达sheer diversity(绝对多样化)的含义，inexhaustible(无穷无尽的)符合句意。故答案为C。controversial“争论的”；remarkable“明显的”。
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