单项选择题

A．One hour.
B．Half an hour.
C．Around 20 minutes.
D．As long as Susan wishes.
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单项选择题
A．A big steak.B．A piece of bread.C．A bottle of milk.D．An extra bone.
A．A big steak.
B．A piece of bread.
C．A bottle of milk.
D．An extra bone.
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.
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