According to the weather forecast, it will be _____weather that we had better stay at home.

A．such a bad

B．such bad

C．so bad a

D．so bad

在上下牙弓咬合时（）

A.牙齿的合面同时全部接触

B.仅能接触后牙颊舌尖

C.仅能接触后牙舌尖

D.仅能接触后牙工作尖与下颌前牙的切缘

E.仅能接触后牙工作尖与上颌前牙的切缘