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单项选择题

140.女性28岁，婚后2年未孕，常规妇科检查。关于子宫峡部错误的是（）
A.
宫体与宫颈之间最狭窄的部分 B.
上端是解剖学内口，下端是组织学内口 C.
其黏膜与宫颈黏膜相同 D.
晚期妊娠时形成子宫下段可达7-10cm E.
其内膜可随月经周期而有周期性变化

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单项选择题‌对于句子“航空公司在最后一刻取消了航班，旅行团被迫改变行程。”的四个英语译文，最佳翻译是‎ ‌‎

A．As the airline cancelled the flight at the last minute,the travel group have to change its itinerary.
B．The airline cancelled the flight at the last minute,so the travel group have to change its itinerary.
C．The airline cancelled the flight at the last minute ,which compelled the travel group to change its itinerary.
D．The last-minute cancellation of the flight by the airline compelled the travel group to change its itinerary