“玉不琢，不成器，人不学，不知义”， 古代《三字经》里的许多做人道理对我们现代人仍然适用。但“君则敬，臣则忠，当顺叙，勿违背”则与现代民主思想相背离。这启示我们，对待传统文化需要(     )

①百花齐放，百家争鸣        ②取其精华，去其糟粕

③求同存异，兼收并蓄        ④批判继承，古为今用

    December 16, 2013 was my birthday. It was the day ____ my best friend left me. I remember it as if it were yesterday. It was also our Christmas concert. ____(offer) a job in Colorado, my friend's father had to leave our city. And his family had to go with ____(he). Mr. Escalante, our old headmaster, brought her whole family up on the stage, and they made a big ____(announce) about how they ____(leave). After the concert ended, I was in a total mess. I felt as if I had made something torn out of my body that could never be ____(full) replaced. My best friend's name was Hannah Zona.

    Ever since I was a little girl, my family was always with the Zonas. We would go to the fair, did anything you could think of. ____(live) so close ____ each other, we could always go to each other's houses after school. ____she is about 7 years older than me, we act like we are sisters. ____(word) can't describe how much I miss her. When she comes back to California, it's like we were never apart. Hannah Zona is the best friend you could ask for. No one could ever replace her and the love I have for her.

如图示，质量为m的物体，在与水平方向成θ角的拉力F作用下，在水平面上做加速度为a的匀加速运动。已知物体与水平面间有弹力作用且动摩擦因数为μ，则物体所受的各力产生的加速度的大小，下面说法正确的是 （    ）