题目内容
(请给出正确答案)
[主观题]
A.The heart pumps blood in two directions.B.Time blood is circulated round the body in
A.The heart pumps blood in two directions.
B.Time blood is circulated round the body in one direction only by the pumping action of the heart.
C.The blood moved with a backward and forward motion.
D.The heart pumps blood in all directions.
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