单项选择题

A．To locate as many sources as possible.
B．To find the exact idea you want to research.
C．To type in the correct names and years.
D．To use the very specific key word.
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单项选择题
A．Professor and student.B．A college boy and a college girl.C．Two college boys.D．Husband and wife.
A．Professor and student.
B．A college boy and a college girl.
C．Two college boys.
D．Husband and wife.
单项选择题
A．To make recommendations on sensible dieting.B．To report the latest advances in brain surgery.C．To relate an experiment combining sleep and exercise.D．To advise on ways of dealing with sleep difficulties.
A．To make recommendations on sensible dieting.
B．To report the latest advances in brain surgery.
C．To relate an experiment combining sleep and exercise.
D．To advise on ways of dealing with sleep difficulties.
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