素体阳虚又感受寒邪的患者，治以助阳解表法，应属于（）
A.先治其标
B.先治其本
C.标本兼治
D.虚则补之
E.以上皆不是
参考答案：C
．— I ____ to your birthday party last Sunday.
— Unfortunately, you were out on business.
A．had come
B．came
C．would come
D．would have come
大圆的半径正好是小圆的直径，那么大圆的面积比小圆面积大[ ]
A．2倍
B．3倍
C．4倍
D．5倍
