题目内容：
It can not be denied that the existing resources on earth will be depleted, but scientists are __________to concede the inevitability of that day, __________that new energies can be found in the near future.
参考答案：
答案解析：
单选题：It can not be denied that the existing resources on earth wi
- 题目分类：GRE
- 题目类型：单选题
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