单项选择题

Theory is based on practice and( )turn serves practice.

A．in
B．by
C．at
D．on
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单项选择题
I can see you have put a lot of time( )it.
A．into
B．on
C．with
D．under
单项选择题
汉译英：“宰前兽医检验；途径口岸”，正确的翻译为：( )。
A．ante - mortem veterinary inspection; part of call
B．animal and plant quarantine; part of calle
C．ante - mortem veterinary inspection; place of issue
D．animal and plant quarantine; place of issue
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