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.
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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.
单项选择题
A．Her husband had got a higher position.B．Her husband had lost his job.C．She wanted to have a cleaner house.D．She wanted to move to New York.
A．Her husband had got a higher position.
B．Her husband had lost his job.
C．She wanted to have a cleaner house.
D．She wanted to move to New York.
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