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【单选题】
以下哪一项不是乳牙外伤的特点A.
乳牙外伤多发生在1～2岁
B.
多发生在室内
C.
冠折和根折较常见
D.
外伤牙齿多发生在上颌中切牙
E.
发生率低于恒牙
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举一反三
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【单选题】听力原文： More than 100,000 miners, railway workers and London bus drivers staged a one-day strike yesterday, creating chaos for British travelers on the worst day of industrial unrest for years. The firs...
A.
employers
B.
commuters
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