单项选择题

Typical （） and symptoms are often seen here.

A.signs
B.mark
C.sign
D.marking

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单项选择题
The researchers hypothesized that some of the （） may help reduce a person’s risk of colon concer.

A.combination
B.consumption
C.compounds
D.cmposition
单项选择题
This condition （） primarily the microscopic air sacs.

A.affecting
B.affects
C.affect
D.affection
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