Every boy and every girl in our school _____ to join one or two clubs according to their hobbies.

A．are encouraged

B．encourage

C．is encouraged

D．is encouraging

在路由器给某一数据包选定了最优路径后，它将继续下面的哪一项？（）

A.广播

B.在路由选择表中存储该数据包

C.选择一路由选择协议

D.交换数据包