急性会厌炎最主要的症状是
A．吞咽疼痛B．声哑C．呼吸困难D．吞咽异物感E．咯血
参考答案：A
"Mr. Smith is ill in hospital." "_____." [ ]
A. I'm sorry to hear that
B. Yes, he has to see the doctor
C. Don't worry about it
D. I'm glad to hear that
目前一号线早晚通风的日期是有何规定，在EnCs上如何操作？
