题目

Tom is Lily, both of whom are responsible for their students. A . so good a teacher as B . as a good teacher as C . as good a teacher as D . such good a teacher as 答案：C站在高为h的阳台上，以水平初速度向外抛出一个小球，小球落地时的速度为，竖直分速度为，如果不考虑空气阻力，下列关于物体在空中运动时间的表达式，正确的是 (   )A．B．C．D．