单项选择题
W: Did you watch the 7 o’lock program on channel 2 yesterday evening?1 was about to watch it when someone came to see me.M: Yeah!It reported some major breakthroughs in cancer research. People over 40 would find a program worth watching.Q: What do we learn from the conversation about the TV program?（）
A．It could help people of all ages to avoid cancer．B．It was mainly meant for cancer patients．C．It might appeal more to viewers over 40．D．It was frequently interrupted by commercials．
单项选择题 公称直径为600mm的液体管道在压力试验合格后应进行吹洗工作，正确的做法是（）。
单项选择题 纳税期限是指纳税人将应纳税款缴入国库的期限。( )
单项选择题 Internet addicts are people who（）.
