心功能Ⅰ级者
A．急性阑尾炎B．肠套叠C．肠扭转D．卵巢囊肿E．急性胆囊炎
参考答案：A
The book was written in 1946, _____ the education system has witnessed great changes.
A．when
B．during which
C．since when
D．since then
支气管哮喘发作的主要病理基础是（）
A.细菌感染
B.支气管痉挛
C.副交感神经兴奋
D.支气管分泌物增多
E.气道的非特异性炎症
