单项选择题

Advertising costs are not in reasonable ______ to the total cost of the product.

A．proportion
B．connection
C．reaction
D．relation
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单项选择题
Will you buy me ______ stamps when you go out
A．some
B．any
C．little
D．a few of
单项选择题
Electrical energy may be divided into two components ______ as positive and negative.
A．distinguished
B．specified
C．separated
D．indicated
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