Why _____ you stay at home and play? [ ]
A. isn't
B. don't
C. aren't
D. doesn't
答案:B
常见的青紫型先天性心脏病是()
A.室间隔缺损
B.房间隔缺损
C.动脉导管未闭
D.法洛四联症
E.肺动脉狭窄
肺内多发空洞可见于下列哪些疾病:()
A.肺结核
B.过敏性肺炎
C.肺吸虫病
D.转移性肺癌
E.韦格肉芽肿