Internet is educational . Many people think children should ____to surf the Internet as they wish . In this way ,they can look____ different subjects on different kinds of websites according to their own interest . But in my opinion ,children should always be watched____surfing the internet .

    Many websites have information and pictures that children should not see .There are many things that children don't understand .All of these may have some bad influence on children's ____ Also , it is dangerous to let childern use chat rooms by themselves .Many parents tell their children not to talk to ____on the street , so they should be careful of ____their children talk to on the internet,too . What's ____ sitting in the front of a computer for a long time isn't good for children's eyes , so ____should monitor(监视) the time that children spend on the internet .

    In a word ,children should ____ away from anything that could be bad for them . I ____believe that it is necessary for parents to watch their children when they use internet .

已知a>0.b>0,,a,b等差中项是$\frac{1}{2}$,且$\alpha =a+\frac{1}{a},\beta =b+\frac{1}{b}$, ,则$\alpha +\beta$最小值(  )

区里耍举行中学生篮球联赛，九年级(2)班的小龙同学因球技高超，被选人学校篮球队且成为主力。可是本届篮球联赛为期两周，每天下午课余时间还要训

练，这势必耽误中考前的复习。对此，下列认识正确的是(    )

①小龙的个人意愿与集体的共同要求产生了冲突       ②考前复习最重要，小龙应坚决不参加比赛

③小龙的意愿与集体的共同要求是完全对立的           ④小龙应该先参加比赛，再通过找老师、同学补课等方式弥补耽误的时间