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【单选题】
女，23岁。间歇性吞咽困难3年，X线钡餐检查显示食管下端呈鸟嘴样狭窄。可能性最大的疾病是（）。A.
食管下段癌
B.
贲门失弛缓症
C.
食管炎
D.
食管瘢痕性狭窄
E.
食管平滑肌瘤
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【单选题】听力原文：M: Don't you think Mary is the best one in our piano class? W: You are the only one to say so. Q: What can we learn from the conversation? (3)
A.
Mary is the best piano player in the class.
B.
Mary is the only piano player in the class
C.
The woman thinks Mary is the best piano player in the class.
D.
The woman doesn't think Mary is the best piano player in the class.
【简答题】举例说明溶液 pH 对药物被动转运的影响的实际意义?