中期食管癌是指（）
A.病变范围局限黏膜层
B.侵入黏膜下层
C.侵入部分肌层
D.无远处淋巴结转移
E.侵及外膜
参考答案：C, D
--- _______ that he picked up French?
--- It was in 2010 _______ he traveled in France.
A．Was it when; that
B．When was it; that
C．Was it when; when
D．When was it; when
能和NaOH共存于水中的物质是（ ）
A．硝酸钾
B．硫酸
C．二氧化碳
D．硝酸铜
