慢性阻塞性肺疾病常见的临床表现有（）
A.气短和呼吸困难
B.喘息和胸闷
C.慢性咳嗽
D.发热
E.咳痰
参考答案：A, B, C, E
估算430÷7时，我们可以把430看做（ ）来算，大约得（ ）。
_____ miss the train, our teacher had to get up very early this morning. [ ]
A. In order not to
B. So as to not
C.In order to not
D. So as not to
