D
考查名词辨析。句意为：因为H7N9禽流感，上海所有的活禽市场都被关闭直到另行通知才能开放。sign迹象，手势；symbol象征，符号；signal信号；notice通知。根据句意可知，应选D项。
答案： D
(2014·福建省普通高中质量检查)Because of H7N9 bird flu，all the chicken m
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