顿咳的表现特点是（）
A.咳声重浊
B.咳声低微
C.咳声紧闷
D.咳声如犬吠
E.咳终止时作鹭鸶叫声
参考答案：E
生态系统的调节能力是巨大的，足以维持自身的绝对稳定性．______．
A: Excuse me, is there a parking lot anywhere around hereB: ().
A. Sorry, there is no park around here.
B. Yes, you’ve asked the right person. I’m very familiar with this place.
C. No problem. I know where it is.
D. Yes, there’s one near the end of the street. It’s behind the church.
