单项选择题

The heating system in the hotel is very advanced, and its temperature can be controlled ____________.

A．automatically
B．artificially
C．manually
D．economically
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单项选择题
The general manager brought ____________ a new reform plan on the personnel system for the company.
A．about
B．down
C．on
D．forward
单项选择题
Having been ill for a few years, she had a particularly fragile ____________.
A．constitution
B．institution
C．construction
D．instruction
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