中华人民共和国公民有受教育的（）
A、权利
B、义务
C、权利和义务
D、权力
参考答案：C
—Why are you in such a hurry?
—I was told that my mother had been sent to the hospital. I have to leave ______. [ ]
A. before long
B. right now
C. from now on
D. all the time
下面四种无线局域网协议最早提出的是（）
A、802.11
B、802.11a
C、802.11g
D、802.11n
