单项选择题

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

A. revenue
B. commission
C. salary
D. pension

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There is no doubt that the （）of these goods to the others is easy to see.

A. prestige
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Most insulation devices of this kind, （）manufactured for such purposes, are extremely expensive to install.

A. that are
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