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【单选题】

A、The heart pumps blood in two directions.

B.The 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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根据网考网移动考试中心的统计,该试题:

15%的考友选择了A选项

61%的考友选择了B选项

19%的考友选择了C选项

5%的考友选择了D选项

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