题目

Lin Qiao is a student of Grade Eight. She always works hard   31   her lessons, such as Geography, History, Computer Studies. English is her favourite   32  . She thinks that English is as   33   as Chinese, but it’s different from Chinese. A lot of words and expressions are hard to remember. She often takes her Walkman with her, and spends much time   34   speaking English with it. She often helps others   35   their lessons after she finishes   36   her homework. She is   37   of all the students in Science class. Her classmates all   38   her for he如图所示，球A在斜面上，被竖直挡板挡住而处于静止状态，关于球A所受的弹力，以下说法正确的是 A．A物体仅受一个弹力作用，弹力的方向垂直斜面向上B．A物体受两个弹力作用，一个水平向左，一个垂直斜面向下C．A物体受两个弹力作用，一个水平向右，一个垂直斜面向上D．A物体受三个弹力作用，一个水平向右，一个垂直斜面向上，一个竖直向下