题目

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式(最多限填3个单词)。 Soniais 14 years old. She couldn't stand Beijing Opera in the past. She thought it meaningless. When she met Beijing Opera programson TV, she always changed to other programs. Like most middle school students,Sonia liked pop music. Ten months ago, Sonia's father (find) a job in Beijing, so she also went toBeijing. She started (study) at No.15 Middle School, and shestarted to learn Beijing Opera in music (class) every week, Sonia and her classmateslisten to Be如图所示，杠杆在F1和F2作用下在水平位置平衡，已知AO＜B0，F1和F2的大小和方向都不变，若将它们的作用点同时向支点0移动相同距离L，则（　　）A．杠杆的A端向下倾斜B．杠杆的B端向下倾斜C．杠杆仍保持平衡D．无法判断