______(50)A. Sofar we have not known exactly yet
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______(50)
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：D
这一段都是叙述心脏疾病医生Gordon Ewy的观点，在其他地方都没有提到他，因此选项D His studies show...实际上已经为我们提供了答题的线索，内容也能前后衔接。