一I can't go to school today. I have a headache.

一_________[ ]

A. That's OK.

B. It doesn't matter.

C. I hope not.

D. I'm sorry to hear that.

互联网专线出现无法上网时，可以通过（）处理。

A.网线松动

B.检查网卡

C.局域网交换机故障

D.查看“本地连接”是否显示为“禁用”