单项选择题

There is a （）difference in meaning between the words surroundings and environment.

A．gentle
B．subtle
C．feeble
D．humble

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单项选择题
They are well （）with each other since they once studied in the same university.

A．identified
B．recognized
C．acknowledged
D．acquainted
单项选择题
It's a pleasure for him to （）his energy and even his life to research work.

A．dedicate
B．dictate
C．decorate
D．direct
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