The Chinese Education Department suggests teachers should receive ______ education to catch up with the development.

A．farther；late

B．farther；later

C．further；lately

D．further；latest

属于第二序列的弯曲有（）。

A.外展弯

B.后倾弯

C.转矩

D.内收弯

E.前牙轴倾弯