主动脉瓣狭窄可触及
A．先天性发绀型心脏病B．心绞痛C．胆道蛔虫症D．急性腹膜炎E．一侧胸腔大量积液
参考答案：A
北方出现“秋高气爽”天气的原因是[ ]
A、高压系统控制
B、低压系统控制
C、暖锋控制
D、冷锋控制
“Perhaps we need to send for Dr. Smith to see what we can do about it,” Father suggested ________ to his neighbor who had come to discuss the problem.
A．tentatively
B．thoughtlessly
C．definitely
D．rudely
