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
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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
单项选择题
All the following problems are implied as possible causes of campus suicide incidents EXCEPT ________.
A．poor academic results
B．failing to get proper sleep
C．lack of family concern
D．family history of mental illness
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