发文字号应当包括机关代字、年份、序号。( )
参考答案：对
解析： 略
单纯左心衰竭的的典型体征（）。
A.双下肢水肿
B.双肺底湿啰音
C.移动性浊音阳性
D.肝压痛
E.颈静脉怒张
In big cities like London, Paris, New York, you can see street musicians _____ all kinds of music such
as Rock and Roll, Jazz, the Blues in the streets. [ ]
A. perform
B. make
C. act
D. do
