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Today almost everyone knows computers and the Internet. If I ask you “what is the most important in your life?” maybe you will say “Computers and the Internet.” The first computer was made in 1946. It was very big but it worked slowly. Today computers are getting smaller and smaller. But they work faster and faster, What can computers do? A writer has said, “People can’t live without computers today.” The Internet came a little later than computers. It is about twenty-five years later than computers. But now it can be found almost everywhere. We can use it to read books, write letters, do shopping, play games or make friends. Many students like the Internet very much. They often go into the Internet as soon as they are free. They make friends on the Internet and maybe they have never seen these friends. They don’t know their real names, ages, and even sex(性别). They are so interested in making the “unreal friends “that they can’t put their hearts into study. Many of them can’t catch up with others in many subjects because of that. We can use computers and the Internet to learn more about the world. But at the same time, we should remember that not all the things can be done by computers and the Internet. 小题1:The Internet can not be used for______. A. studying B. shopping C. thinking D. playing 小题2:When the computer was invented, it was______. A. large and worked quickly B. small and worked slowly C. large but worked slowly D. small but worked quickly 小题3:The Internet was born in about______. A.1960 B.1970 C.1980 D.1985 小题4:Which of the following is true ? A. Few students like going into the Internet. B. Students use the Internet to make “unreal friends.” C. These “unreal friends” often meet each other. D. Students know the friends on the Internet very well. 小题5:What does the writer think of the Internet? A. It is wonderful. B. It can make students study harder. C. It is not good for students. D. It is helpful, but we can’t do everything on it.
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举一反三
【多选题】关于弹力的方向,以下说法正确的是()
A.
压力的方向总是垂直于接触面,并指向被压物
B.
支持力的方向总是垂直于支持面,并指向被支持物
C.
绳对物体拉力的方向总是沿着绳,并指向绳收缩的方向
D.
杆对物体弹力总是沿着杆,并指向杆收缩的方向
【单选题】设N A 为阿伏加德罗常数的值,下列叙述中不正确的是 [     ] ①12.4g白磷晶体中含有的p-p键数是0.6N A ②电解精炼铜时转移了N A 个电子,阳极溶解32g铜 ③100g的98%的浓H 2 SO 4 中所含的氧原子数为4N A ④2mol SO 2 和1mol O 2 混合在V 2 O 5 存在的条件下于密闭容器中加热反应后,容器内物质分子数大于2N A ⑤2.9g 2CaSO ...
A.
②③⑤⑥⑦
B.
①③④⑤⑥
C.
①②③④⑤
D.
③④⑤⑥⑦
【单选题】微波清解仪可以用来消解
A.
汽油
B.
牛奶
C.
甘油
D.
乙醇
【单选题】下列关于弹力的说法不正确的是( )
A.
茶杯对桌面的压力是由于茶杯发生形变而产生的
B.
两个物体直接接触且发生弹性形变时才会产生弹力
C.
弹簧测力计在测量时,可以竖直拉,也可以倾斜拉
D.
弹性限度范围内,弹簧的长度越长,产生的拉力越大
【判断题】A new copier has been
A.
正确
B.
错误
【简答题】A () copier has been
【单选题】关于弹力、摩擦力,以下说法正确的是()
A.
两物体间如果存在弹力,一定同时存在摩擦力
B.
物体的弹性形变增大,弹力一定会随之增大
C.
增大两物体间的弹力,物体间的摩擦力也一定会相应增加
D.
同一接触面间产生的弹力和摩擦力,方向可以不垂直
【多选题】关于弹力的方向,以下说法正确的是()
A.
压力的方向总是垂直于接触面,并指向被压物
B.
支持力的方向总是垂直于支持面,并指向被支持物
C.
绳对物体拉力的方向总是沿着绳,并指向绳收缩的方向
D.
杆对物体的弹力总是沿着杆,并指向杆收缩的方向
【单选题】明确提出社会主义经济是“在公有制基础上的有计划的商品经济”的论断是()。
A.
党的十二大
B.
党的十二届三中全会
C.
党的十三届三中全会
D.
党的十三大
【单选题】关于弹力,以下说法不正确的是( )
A.
拉力、压力、支持力性质上均为弹力
B.
物体由于发生了弹性形变,会对使其发生弹性形变的物体施加弹力作用
C.
对同样一根弹簧,弹性形变越大,弹力越大
D.
许多物体可以在不发生形变的条件下对物体施以弹力作用
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