阅读短文，判断正误。

    Hi, my friend! I'm Mary. I'm from the UK. I'm 9. At school, my father is my English teacher. And I'm his pupil. I like watermelons and strawberries. Look！This is my new schoolbag, I have nine books and a nice pencil box. How many books do you have?

北半球各地昼渐短、夜渐长的时期是（　　）

设函数f（x）=2cos（ωx+φ）对任意的x都有$f\left(\frac{\mathrm{\pi }}{4}+x\right)=f\left(\frac{\mathrm{\pi }}{4}-x\right)$，若设函数g（x）=3sin（ωx+φ）﹣1，则$g\left(\frac{\mathrm{\pi }}{4}\right)$的值是____