______(49)A. Sofar we have not known exactly yet
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______(49)
A. Sofar,we have not known exactly 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 a-bility.
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.
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答案：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It said只能适用于American Heart Association，其他空白处均不合适。