慢性阻塞性肺气肿的主要症状为（）
A.心悸
B.口唇发绀
C.右心衰竭
D.突发性喘息
E.逐渐加重的呼吸困难
参考答案：E
"遇到这种情况，你会哭吗？"属于（）提问。
A.封闭式提问
B.开放式提问
C.半开放式提问
D.限制性开放式提问
—Now, people's life in Hengyang is ______ than before.
—Yes. Many people have their own cars. [ ]
A. much better
B. less better
C. more better
