---How about the trip to Shanghai, Kitty?

---Everything was fantastic if our car did not _______ for some times on the way.

A．slow down

B．break down

C．put down

D．turn down

范围在几百米到十几公里内办公楼群或校园内的计算机相互连接所构成的计算机网络是( )。

A．局域网

B．城域网

C．广域网

D．互联网