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
These newly unearthed cultural relics on the origin of Chinese characters ______ the intelligence of our remote ancestors.
A．manifest
B．magnify
C．maintain
D．manipulate
单项选择题
Meanwhile, I always kept in touch with my former professor at college, by letter and telephone.
A．kept pace with
B．kept in contact with
C．had an idea of
D．exchanged letters with
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