宣泄消极情绪要在法律和道德的范围内进行，不能妨碍他人。（  ）

函数$f\left(x\right)=x^2-x-2,x\in -5,5$，那么在区间-5,5中任取一个值x₀，使$f\left(x_0\right)\le 0$的概率为(    )

①f(f（1）)>f（3）；               ② $\exists$ x₀∈(1,+∞),f'(x₀)=-1/3；

③f(x)的极大值点为x=1；       ④ $\forall$ x₁,x₂∈(0,+∞),|f(x₁)-f(x₂)|≤1

其中正确的有____（写出所有正确命题的序号）

甲乙两地相距120千米，某人骑自行车，从甲地到乙地，去时用了5小时，回来时加快速度用了4小时，他往返一次平均每小时行多少千米？

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

Dear Mike,

    How are you? I have a good time at my new 1 in Beijing, China. Here, I'm good 2 my teachers and classmates. They all like me and I also like 3. At school my favorite 4 are Chinese and music. And I 5 two clubs, the Chinese club and the music club. In the music club, I have a good friend. Her 6 is Yang Peiyi. She likes music. She 7 well. She can also play the piano and the violin. She says she wants to be a 8. Yang Peiyi likes 9, too. On weekends she often plays tennis or ping-pong with me. Do you want to know her? Look! Here is a 10 of her. I think you'll like her.

                                                                                                                                                                       Yours,

                                                                                                                                                                       Maria