青蛇毒的病机为：（）

A.气血瘀滞，脉络滞塞不通

B.气血两虚，脾胃不和

C.湿热下注

D.营卫不和

E.以上都不是

—Mum,it is nice weather.I want to skate this afternoon.

—Don't you think the ice on the lake is too thin to________your weight?[ ]

A. carry  

B. bear

C. catch  

D. take