题目

 下列关于电容器的说法，正确的是A．电容器带电量越多，电容越大 B．电容器两板电势差越小，电容越大  C．电容器的电容与带电量成正比，与电势差成反比D．随着电容器电量的增加，电容器两极板间的电势差也增大  答案： B 语篇翻译American people started the TV-turnoff Week in 1994. During that week, millions of Americans will keep their TV off for a week. Do you know why?45. One of the main reasons is that they spend too much time on TV. The TV is on for about seven hours and forty minutes a day! 46. They should take their free time more seriously. Children watch TV for too long. As a result, they get poor marks at school. 47.孩子们没有足够的时间去做运动。 They also have health problems. 48 他们变得越来越胖。The TV-turnoff Week helps people watch less television. 49. It makes people have more time to do other things such as drawing and reading. It also gives them chances to be with their family and friends.1._____________________________________2._____________________________________3._____________________________________4._____________________________________5._____________________________________