休克病人应采取10°-20°（），下肢抬高（）.
参考答案：中凹卧位；20°-30°
《素问•阴阳应象大论》指出“伤形”的病因是（）
A、寒暑
B、喜怒
C、悲
D、恐
E、劳作
David __________ with Cathy for two years before they got married.
A．has fallen in love
B．has been in love
C．had fallen in love
D．had been in love
