题目

如图所示，真空中存在范围足够大的匀强电场，A、B为该匀强电场的两个等势面。现有三个完全相同的带等量正电荷的小球a、b、c，从等势面A上的某点同时以相同速率向不同方向开始运动，其中a的初速度方向垂直指向等势面B；b的初速度方向平行于等势面；c的初速度方向与a相反。经过一段时间，三个小球先后通过等势面B，已知三个小球始终在该匀强电场中运动，不计重力，则下列判断中正确的是                    （    ）A．等势面A的电阅读短文，根据短文内容选择正确的答案。Coffee has become the most popular American drink. Today people in the United States drink more coffee than（比）people in any of the other countries. People drink coffee at breakfast, at lunch, at dinner, and between meals. They drink hot coffee or coffee with ice in it. They drink it at work and at home. They eat coffee ice-cream and coffee candy（糖果）. Coffee is black and very strong. Different people like to drink it in different ways. Some people like coffee with cream or sugar in it. Other people like coffee with both cream and sugar in it. In all ways it is served（提供服务）. Coffee has become an international（国际的）drink1.Coffee is an ________ drinkA.interestingB.internationalC.ice-creamD.America2.Different people like to drink coffee __________A.at work or at homeB.in different waysC.with cream or sugarD.between meals3.Today Americans drink ____ coffee than people in any of the other countriesA.as much asB.lessC.moreD.most4.“Coffee is black and very strong.” The word strong here means ______A.坚固的B.淡的C.强壮的D.浓的5._____ is the most popular American drinkA.Black teaB.CoffeeC.Water with iceD.Whisky