单项选择题

The author of the report is well ______ with the problems in the hospital because he has been working there for many years.

A．informed
B．acquainted
C．enlightened
D．acknowledged
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You should avoid ______ when you join them for the first rehearsal.
A．from being mocked at
B．being mocked at
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______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.
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B．For
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