单项选择题

Scientific research results can now be quickly （）to factory production.

A. used
B. applied
C. tried
D. practiced

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单项选择题

Am I to understand that his new post （） no responsibility with it at all

A. keeps
B. supports
C. carries
D. possesses

单项选择题

The first two stages in the development of civilized man were probably the invention of weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the （）.

A. latter
B. latest
C. later
D. last

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