问题
选择题
However ______ certain natural resources may be, they cannot reproduce themselves and
are surely to be used up eventually.[ ]
A. rigid
B. terminal
C. abundant
D. violent
答案
答案：C
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However ______ certain natural resources may be, they cannot reproduce themselves and
are surely to be used up eventually.[ ]
A. rigid
B. terminal
C. abundant
D. violent
答案：C