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单项选择题

A．It is time range of the study.
B．It is the number of women followed.
C．It is the result of the study.
D．It is decrease rate of disease.
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单项选择题A．Alexis is good at acting and singing.B．Alexis plays a leading role in every film he acts.C．Alexis is an easy-going and passionate actor.D．Alexis s craft in acting needs to be improved.

A．Alexis is good at acting and singing.
B．Alexis plays a leading role in every film he acts.
C．Alexis is an easy-going and passionate actor.
D．Alexis"s craft in acting needs to be improved.

单项选择题A．9 years.B．19 years.C．20 years.D．30 years.

A．9 years.
B．19 years.
C．20 years.
D．30 years.