题干
Don't worry about Shirley. She can ________ herself.
A：look at
B：look after
C：look for
答案(点此获取答案解析）
B
静止在水平面上．一根弹性轻杆一端垂直固定在斜面上，杆的另一端固定一个重为2 N的小球，小球处于静止状态时，下列说法正确的是( )