2. 外语
  3. However ______ certain natural resources may be, they cannot reproduce themselves and are bound to be used up ultimately.

However ______ certain natural resources may be, they cannot reproduce themselves and are bound to be used up ultimately.

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问题 However ______ certain natural resources may be, they cannot reproduce themselves and are bound to be used up ultimately.
选项 A、abundant
B、adequate
C、sufficient
D、satisfactory
答案A
解析 题意是：不管某些自然资源多么______，但它们不能自我再生，最终仍会耗尽。[A]abundant“充裕的，丰富的”，符合题意。[B]adequate“足够的，适当的”，[C] sufficient“足够的”，[D]satisfactory“令人满意的，恰当的”都不符合题意。
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大学英语四级

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