能使动脉血压波幅增大的原因是
A．心动过速
B．小动脉硬化
C．主动脉瓣狭窄
D．大动脉硬化
参考答案：D
You _____ Jim anything about it. It was none of his business.
A．needn’t have told
B．needn’t tell
C．mustn’t have told
D．mustn’t tell
胸膜凹陷征
