Because of H7N9 bird flu, all the chicken markets in Shanghai have been closed and won't o

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A. sign
B. symbol
C. contact
(答案→)D. notice
解析：选D　考查名词辨析。句意：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”；contact“联系”；notice“通知”。根据句意可知，应选D。