（49）__________ 查看材料A.So far we have not known exac
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（49）__________ 查看材料
A.So far， we have not known exactty yet whether mouth-to-mouth breathing is really useless in CPR.
B.Only ten percent of the victims treated with traditional CPR survived with good brain ability.
C.CPR keeps blood and oxygen flowing to the heart and brain.
D.His studies show that many people do not want to perform. mouth-to-mouth breathing on a stranger for fear of getting a disease.
E.It said people should increase the number of chest presses from fifteen to thirty for every two breaths given.
F.No mouth-to-mouth rescue breaths were given to them.
请帮忙给出正确答案和分析，谢谢！
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正确答案：正确E
本空白处的前一句是说美国心脏协会于2005年修改了CPR中胸部按压的指导准则，空白处的后面又没有提到如何修改，选项E正好填补了这个内容。而且还要注意，选项E中的Itsaid只能适用于AmericanHeartAssociation，其他空白处均不合适。