单项选择题

Both diet and exercise ______ blood pressure.

A．effect
B．affect
C．afflict
D．affirm
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单项选择题
He will abide by his promise if he gives it.
A．allow for
B．renege on
C．renew
D．stick to
单项选择题
The first step in planning a marketing strategy for a new product is to analyze the breakdown of sales figures for competitive products.
A．decrease in
B．reordering of
C．itemization of
D．collapse in
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