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
The phrase be well on with in Line I of Paragraph 1 most probably means ______.
A．to get prepared to do
B．to get along well with
C．to try to complete
D．to be very good at
单项选择题
The passage is mainly about________
A．the benefits of manageable stress
B．stay away from
C．run out of
D．put up with
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