题目内容

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怎样，what什么；where在哪儿；when什么时候。句意：世界卫生组织给了一些关于如何保护我们不感染h7n9病毒的建议。结合语境可知选A。
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