--- Hurry up. The bus is coming.

--- Oh, no. We mustn’t cross the street        the traffic lights are green.

A．until

B．since

C．while

D．after

下列域名中，属于教育机构的是

A．ftp.bat.net.cn

B．ftp.cng.ac.cn

C．www.ioa.ac.cn

D．www.pku.edu.cn