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

ETA means（）time of arrival.

A．excepted
B．export
C．estimated
D．exchange

单项选择题

汉译英：“放射性检验证书；验残证书”，正确的翻译为：（）。

A．certificate of measurement; certificate of damage
B．certificate of radioactivity; certificate of damage
C．certificate of radioactivity; certificate of cleanliness
D．certificate of origin; certificate of eleanliness