常顶冷回流量越大，塔顶压力会（）。
A.升高
B.降低
C.不变
参考答案：A
将下列句子改为感叹句。
1. It is a busy day. (how)
2. The weather is very bad. (what)
3. You cooked nice food. (how)
_
4. The water here is very clean. (what)
5. This kind of car is too expensive. (how)
____
什么叫山脉？
