These instruments are so powerful as to enable them to ascertain many facts of t

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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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