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
It pays ____________ to buy goods of high quality.
A．at the end
B．in conclusion
C．at length
D．in the long run
单项选择题
Hamburgers are ordered through a window in the restaurant and then are ____________ through the window to the waiting customer.
A．handed down
B．handed in
C．handed on
D．handed out
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