填空题

Exercise has long been recommended to ______.

【参考答案】

speed recovery from jet leg.
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单项选择题
A．Writing papers for his classes.B．Meeting with his professors.C．Doing extra work in the chemistry lab.D．Working overtime as a librarian.
A．Writing papers for his classes.
B．Meeting with his professors.
C．Doing extra work in the chemistry lab.
D．Working overtime as a librarian.
填空题
But when hamsters in the midst of their sleep cycle were put onto an activity wheel, ______.
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