题目

阅读理解   At school many things happen to us. We may feel excited when we have success in a school play. We may feel sorry if we lose an important game. We want to keep the memory for the rest of our lives.     How to keep the memory? Our English teacher, Miss Wang, has taught us a good way of remembering things to make our own yearbook. What is a yearbook? A yearbook is a kind of book which is used to keep the memory of exciting moments. It's usually made at the end of the year.     Last December, we began to make our yearbook. First we chose the persons who had done something sp对关系式y=2-12x的描述不正确的是（　　）A．当x看作自变量时，y就是因变量B．随着x值的增大，y值变小C．在非负数范围内，y可以最大值为2D．当y=0时，x的值为32