下列细胞中的染色体不成对的是（）

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

A

Mr Wu: Good morning, Bruce. Sit down, please. May I ask you some questions?

Bruce: Certainly. What do you want to know?

Mr Wu: First, when were you born, Bruce?

Bruce: On June 22,1980.

Mr Wu: Secondly, where were you born?

Bruce: In Sydney, Australia.

Mr Wu: Where was your father born?

Bruce: He was born in Sydney, too.

Mr Wu: When was he born?

Bruce: Sorry, I don't know. But I know he's about forty years old.

Mr Wu: I see. What does your father do?

Bruce: He's a doctor. He works in a hospital here.

Mr Wu: Is your mother working in China, too?

Bruce: No, she works in Sydney. She's coming to China soon.

Mr Wu: Oh, that's very good. I have no more questions. Thank you, Bruce.

Bruce: You're welcome, Nr Wu. Good-bye.

Mr Wu: Good-bye.

东汉著名哲学家王符说：“德不称其任，其祸必酷；能不称其位，其殃必大。”这两句话强调了（  ）

In Western countries , people usually do not open gifts right away.