（50）__________ 查看材料A.So far we have not known exac
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（50）__________ 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D
这一段都是叙述心脏疾病医生GordonEwy的观点，在其他地方都没有提到他，因此选项DHisstudiesshow…实际上已经为我们提供了答题的线索，内容也能前后衔接。