These instruments are so powerful as to enable them to ascertain many facts of the deepest interest.

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问题 These instruments are so powerful as to enable them to ascertain many facts of the deepest interest.

选项 A、put out
B、find out
C、wear out
D、turn out

答案B

解析 ascertain:查明;put out:扑灭,伸出;find out:了解,搞清楚,查明(经常接疑问词引导的从句,多数情况下不能与find替换。其意义并非强调结果);wear out:使……筋疲力尽,穿坏;turn out:后来发现是……,被证明是……
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