单项选择题

A．His telephone went out of order.
B．The buyers had to leave soon.
C．He began to work at 8 a. m.
D．He had made an appointment with her for 8 a. m.
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单项选择题
A．It keeps blood vessels from being blocked.B．It speeds up their recovery after surgery.C．It in creases the blood flow to the heart.D．It adjusts their blood pressure.
A．It keeps blood vessels from being blocked.
B．It speeds up their recovery after surgery.
C．It in creases the blood flow to the heart.
D．It adjusts their blood pressure.
单项选择题
A．An annual cycling event.B．Major Canadian bicycle races.C．The contribution of cycling to health.D．How to increase one’’s speed in a bicycle race.
A．An annual cycling event.
B．Major Canadian bicycle races.
C．The contribution of cycling to health.
D．How to increase one’’s speed in a bicycle race.
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