单项选择题

A．At supper - time.
B．Before Jane went to bed.
C．Around eleven.
D．After midnight.
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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．Investors.B．Manufacturers.C．Consumers.D．Traveling salesmen.
A．Investors.
B．Manufacturers.
C．Consumers.
D．Traveling salesmen.
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