题干
It's a pity that the young girl drowned herself after all her hopes were________.
A：beaten
B：defeated
C：failed
D：realized
答案(点此获取答案解析）
B
如图所示，倾角为θ的斜面固定在地面，质量为m的物体，在沿斜面方向的恒力F作用下，沿粗糙的斜面匀速地由A点运动到B点，动摩擦因素为μ，物体上升的高度为h。则在运动过程中:
