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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