_____H7N9 is a deadly virus, it is still safe to eat thoroughly-cooked chicken.

A．UntilB．WhileC．IfD．Since

B

解析試題分析：考查連詞：A. Until直到B. While雖然C. If如果D. Since自從，句意：雖然H7N9是致命的病毒，吃完全燒熟的雞肉還是安全的，選B。
考點(diǎn)：考查連詞
點(diǎn)評(píng)：這幾個(gè)詞都是連詞，要分清每個(gè)連詞短語(yǔ)的含義和用法，做題時(shí)關(guān)鍵看上下文和句意的邏輯關(guān)系做題。While的用法有：1.表示“當(dāng)……的時(shí)候”，2.表示讓步，意為“盡管”“雖然”。3.表示對(duì)比或轉(zhuǎn)折，意為“而”“但是”。

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