单项选择题

A．A period when cars are rushing on the roads.
B．A period when people are going to or from their work.
C．A period when cars are crowed on the roads.
D．A period when people are crowed in the buses.
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单项选择题
A．Because she has changed the appointment twice before.B．Because she is free only at that period of time.C．Because she has got a toothache all day.D．Because her dentist will be busy at other periods.
A．Because she has changed the appointment twice before.
B．Because she is free only at that period of time.
C．Because she has got a toothache all day.
D．Because her dentist will be busy at other periods.
单项选择题
A．you do physical exercises late in the day.B．you have sleeping pills.C．your heart rate increases.D．you rest frequently during the day.
A．you do physical exercises late in the day.
B．you have sleeping pills.
C．your heart rate increases.
D．you rest frequently during the day.
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