Evidenceobtainedfromobservatio

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Evidence obtained from observation and experiment is often used to ________ a scientific theory.

A．confirm	B．claim
C．conclude	D．calculate

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There comes a time in every man's life_____.

A．that he needs to think	B．when he has to think
C．therefore he has to work hard	D．then he will need it

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Although he knew little about the large amount of work done in the field, he succeeded_____ other more well-informed experiments failed.

A．which 　　

B．that 　　

C．what 　

D．where

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A．one of them	B．the largerof which
C．and a larger of of them	D．the largest one of which

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--- Are you familiar with the music ?
--- Yes. There was a time _____ this kind of music was quite popular.

A．when 　　　

B．that 　　　　

C．with which 　

D．about which

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.He has got himself into a dangerous situation ____ he is likely to lose control over the plane.

A．where 　　　

B．which 　　　

C．while

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