常易发生心源性猝死的疾病有（）
A.二尖瓣脱垂
B.主动脉瓣狭窄
C.预激综合征
D.肥厚梗阻性心肌病
E.室间隔缺损
参考答案：B, C, D
.She was terrified of saying something that would make her______herself.
A．express
B．conduet
C．impress
D．betray
绘图题：请画出二位三通阀的符号。
