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

A.reservationB.transformationC.distinctionD.submission

【答案】B

【解析】

考查名詞詞義辨析。句意：許多國家的衛(wèi)生安全系統(tǒng)正在經(jīng)歷重大變革。A. reservation預訂；B. transformation改革，變革；C. distinction區(qū)別；D. submission提交。根據(jù)前文The health security systems可知，此處指“衛(wèi)生安全系統(tǒng)的變革”。故選B。

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