单选题：Since it is gradually more and more difficult to find oil,

题目分类：英语六级
题目类型：单选题
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题目内容：

Since it is gradually more and more difficult to find oil, the petroleum scientists have to move to the more hostile places in the future.

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答案解析：

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分类：英语六级题型：单选题

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第(37)题应填__________

第(37)题应填__________

分类：英语六级题型：单选题

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分类：英语六级题型：单选题