单项选择题

Military orders are ______ and cannot be disobeyed.

A．defective
B．conservative
C．alternative
D．imperative

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单项选择题

Dried vegetables are easy to use if you remember to ______ them overnight.

A．plunge
B．soak
C．put
D．immerse

单项选择题

Professor Taylor's talk has indicated that science has a very strong ______ on the everyday life of non-scientists as well as scientists.

A．motivation
B．perspective
C．impression
D．impact

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