题目

 阅读理解.根据短文的内容, 选择一个最佳答案    How could we live without the Internet ? That's how most of us keep in touch with friends, find homework support, research cool place to visit, or find out the latest news. You can use it to do research for school, find out what movie is on near you, check out a college you're thinking about, or find a job or volunteer opportunity. Almost anything you can think of has a website about it . You've probably heard stories about people who get into trouble in chat rooms. Because users can easily keep anonymous , you may be cheate将抛物线y=2x2向下平移1个单位，得到的抛物线是（ ）A．y=2（x+1）2B．y=2（x-1）2C．y=2x2+1D．y=2x2-1