已知函数$f\left(x\right)=1+\cos 2x-2{\sin }^2\left(x-\frac{\pi }{4}\right)$，则下列结论中正确的是（   ）
①$f\left(x\right)$是奇函数                   ②$f\left(x\right)$的最小正周期为$\pi$
③$f\left(x\right)$的一条对称轴方程是$x=\frac{\pi }{8}$    ④$f\left(x\right)$的最大值为2

解不等式组：$\left\{\begin{array}{c}5x+1>3(x-1)\\ \frac{1}{2}x-1\le 7-\frac{3}{2}x\end{array}\right.$．

计算： $\sqrt{3}\left(\sqrt{3}-2\right)+\left|-2\sqrt{3}\right|-\sqrt[3]{1-\frac{7}{8}}$

     The children often play soccer in the garden(花园). Sometimes they break (打破).Mrs. Smith’s windows.  
One afternoon , Mrs. Smith is reading a newspaper at home. After a short time, she closes her eyes and goes to sleep. At that time a little boy knocks(敲) at the door. Mrs. Smith opens the door and asks, “Do you break my windows again（又一次）?” “Oh, no”, says the boy. “ Your windows are open this time and our soccer is in your room. Can I get it back, please?” 
根据短文内容，选择正确答案。