单项选择题

Surgery usually spans minutes () hours.

A.onto
B.into
C.on
D.to
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单项选择题
Women () have higher rates of obesity than men.
A.usually
B.seldom
C.always
D.now
单项选择题
People who areoldorvery young may not have () synptoms.
A.type
B.special
C.specific
D.typical
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