下列说法正确的是（　　）

我们把焦点相同，且离心率互为倒数的椭圆和双曲线称为一对“相关曲线”．已知F₁、F₂是一对相关曲线的焦点，P是它们在第一象限的交点，当$\angle F_{1}P{F}_2=60°$时，这一对相关曲线中双曲线的离心率是（　　）

若函数y=cosx+ax在﹣$\frac{\mathrm{\pi }}{2}$，$\frac{\mathrm{\pi }}{2}$上是增函数，则实数a的取值范围是（　　）

    A year has twelve months. My favorite month is October. October 1^st is National Day(国庆节）. We have a seven-day holiday(假期). During the holiday, my parents always take me to see my grandparents.

    Our school has some interesting things in October. On the 12th , we have a soccer game. I don't love basket ball. It's difficult for me. But I love soccer. I love playing soccer and watching soccer games. We have a book sale on October 20th. I have three old books and I want to sell them. The art festival is fun. We have it on October 29th. My birthday is also on this day. October is a really great month for me.