如图所示，三段细线长OA=AB=BC，A、B、C三球质量之比为3：2：1，当它们绕O点在光滑的水平桌面上以相同的角速度作匀速圆周运动时，则三段线的拉力T_OA：T_AB：T_BC为（   ）

下列各句中，划线的成语使用不正当的一项是（        ）。

    Jodie doesn't like her job. She is a ____. She____to work in the evening. She has to work on____. She is always busy. She doesn't want to work in a restaurant. It's boring.

    She wants to be an ____. She likes to sing and dance. She likes to work ____ other young people. She wants to be in the pop play. She wants to be known by many people.

    ____ now she can only work in the restaurant. She is very unhappy every day.____ can she do? Can you help her?____a letter to her soon.