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

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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、quantifiable
C、controversial
D、inexhaustible

答案D

解析 句意:热带植物绝对的多样性似乎表明有无穷无尽的原材料资源,而事实上这些原材料只有一小部分被使用。inexhaustible无穷无尽的。exploit被开发的。quantifiable可计量的。controversial有争议的。
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