(5) Blood Donation①

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Blood is indispensable to human body.It carries nourishments② and oxygen to tissues③,and at the same time,removes wastes and carbon dioxide④.A person will die if he loses too much blood.Nowadays blood transfusion⑤ is saving millions of dying men.Without a ......（本文共 790 字 ）     [阅读本文] >>


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