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【题目】The health security systems of many countries are undergoing considerable ______.

A.reservationB.transformationC.distinctionD.submission

【答案】B

【解析】

考查名词词义辨析。句意:许多国家的卫生安全系统正在经历重大变革。A. reservation预订;B. transformation改革,变革;C. distinction区别;D. submission提交。根据前文The health security systems可知,此处指“卫生安全系统的变革”。故选B

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