给出定义：若函数f（x）在（a，b）上可导，即f′（x）存在，且导函数f′（x）在（a，b）上也可导，则称f（x）在（a，b）上存在二阶导函数，记f″（x）=（f′（x））′．若f″（x）＜0在（a，b）上恒成立，则称函数f（x）在（a，b）上为凸函数．已知函数f（x）= $\frac{1}{12}{x}^4-\frac{1}{6}m{x}^3-\frac{3}{2}{x}^2$ ，若对任意实数m满足|m|≤2时，函数f（x）在（a，b）上为凸函数，则b﹣a的最大值是____．

下列关于收入分配公平的理解，正确的是

已知$f\left(x\right)=\left\{\begin{array}{c}(3-a)x-4a,x<1\\ {\log }_{a}x,x\ge 1\end{array}\right.$是（-$\infty$，+$\infty$）上的增函数，那么a的取值范围是(  )

It has been reported that the country's health-care reform is still _____ debate.

读—读，填上适当的句子完成对话

A. When's the Mid-autumn Festival? B. It's usually in June. C. It's usually in January or February. D. It's usually in December. E. When's the Double Ninth Festival?

Mice: There are many festivals in a year.

Mice: Yes. When's the Spring Festival?

Mice: ____

Peter: When's the Dragon Boat Festival?

Alice: ____

Peter: ____

Mice: It is usually in September or October.

Peter: ____

Mice: It usually comes in October, after twenty-five days of the Mid-autumn Festival.

Peter: Oh, I see.