化学与我们的生活密切相关．

圆心在抛物线$y^2=2x$上，且与该抛物线的准线和$x$轴都相切的圆的方程是（   ）

阅读理解

    “Billy, one, two, three, get up! It is 25^th February, 2099, seven' o'clock．It's time to get up and go to school, ”says the clock-robot in a loud voice．Then the clothing—robot dresses(给……穿衣服)Billy quickly．Next the kitchen—robot gives Billy some bread and eggs.  Billy doesn't like them, and the kitchen—robot gives him a hamburger．After eating the hamburger, Billy goes to school．When he gets out of the house with his schoolbag, he sees a car-robot waiting for him．“Hello! I will drive you to school．Your name is Billy, isn't it?” asks the car．“Right．”Billy answers．“Now would you please show me your school ID card?” says the car．Billy shows it his school ID card．“Get in, please．”Billy gets in it．Then the car goes on, “l will check your homework today．Please take it out．”Billy does as what the ear-robot says．When they get to school, the car says to Billy, “See you tomorrow, Billy．Good luck!”