单项选择题

As a salesman, he works on a(n) ______ basis, taking 10% of everything he sells.

A．income
B．commission
C．salary
D．pension
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单项选择题
It was a bold idea to build a power station in the deep valley, but it ______ as well as we had hoped.
A．came off
B．went off
C．brought out
D．make out
单项选择题
The habit of economy one of the greatest differences between the savage and civilized men.
A．contains
B．Contributes
C．constitutes
D．continues
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