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什么時候。句意：世界衛(wèi)生組織給了一些關(guān)于如何保護我們不感染h7n9病毒的建議。結(jié)合語境可知選A。
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