The conference was _______ fixed for the 10th, August, but later the unexpected landslide(泥石流) in Zhouqu in Gansu province, made us put it off.

A．normally

B．obviously

C．originally

D．presently

中银e令（ETOKEN）其密码每隔（）变化一次。

A.30秒

B.60秒

C.90秒

D.120秒