下列不易造成局限性肺气肿的是（）
A.支气管异物
B.支气管扩张
C.支气管囊肿
D.支气管良性肿瘤
E.支气管恶性肿瘤
参考答案：C
Just in front of our school _____ [ ]
A. stand many tall buildings
B. do many tall buildings stand
C. many tall buildings stand
D. are many tall buildings standing
样板按其用途分类有哪几种？
