单项选择题

A．Collecting objects on the beach.
B．Creating computer models.
C．Mapping currents in the ocean.
D．Tracking water pollution.
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填空题
Exercise has long been recommended to ______.
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.
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