单项选择题

A．Forty or fifty minutes of exercise once a week.
B．Twenty or thirty minutes of exercise every day.
C．Fifteen or twenty minutes Of exercise five days a week.
D．Thirty or forty minutes of exercise three or four days a week.
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单项选择题
A．He thought she preferred to study alone.B．He thought she had made arrangements to study with.C．He had told her that he had done poorly on a recent test.D．He didn’t know that she was enrolled in a linear algebra course.
A．He thought she preferred to study alone.
B．He thought she had made arrangements to study with.
C．He had told her that he had done poorly on a recent test.
D．He didn’t know that she was enrolled in a linear algebra course.
单项选择题
A．They are checked out.B．They are specially coded.C．They are inspected by the guard.D．They are marked with colored labels.
A．They are checked out.
B．They are specially coded.
C．They are inspected by the guard.
D．They are marked with colored labels.
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