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      The World Health Organization has given some advice on        to protect us from being infected(感染) with H7N9.
      A.howB.whatC.whereD.when
      A
      how怎樣,what什么;where在哪兒;when什么時(shí)候。句意:世界衛(wèi)生組織給了一些關(guān)于如何保護(hù)我們不感染h7n9病毒的建議。結(jié)合語境可知選A。
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