以相同的执行价格同时卖出看涨期权和看跌期权，属于( )。
A．买入跨式套利 B．卖出跨式套利C．买入宽跨式套利 D．卖出宽跨式套利
参考答案：B
My calculations were based on the ________ that house prices would remain steady.
A．theory
B．assumption
C．procedure
D．regulation
患儿，4岁。平素经常感冒，现证见面色苍白，畏寒自汗，气短懒言，肌肉松弛，舌质淡红，苔薄白，脉浮而无力。治疗首选方是
A．归脾汤
B．牡蛎散
C．玉屏风散
D．四君子汤
E．黄芪桂枝五物汤
