嗜铬细胞瘤最主要的症状是（）。
A.高血压
B.低血压
C.心律失常
D.心衰
E.肺水肿
参考答案：A
_____ I toured Lushan Mountain, I was deeply impressed with its beautiful scenery. [ ]
A. The first time
B. For the first time
C. At first
D. It was the first time
在温度计的玻璃泡上蘸一些酒精，取出后，发现温度计示数的变化情况是______（升高/降低/不变），你认为造成这种现象的原因是______．
