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

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单项选择题

This condition （） primarily the microscopic air sacs.

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

单项选择题

A new study in The Lancet says that if current trends （），the result will be unimaginable.

A.continue
B.continues
C.will
B.continuing