（47）__________ 查看材料A.So far we have not known exac
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（47）__________ 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F
空白处的前一句说“439位病人仅仅接受了胸腔按压”，而第一段说过，“CPR包括胸部按压和口对口呼吸”，可见F项说“没做口对口呼吸的急救措施”是补充说明前一句的。