①网上交往突破了空间限制                ②我们可以利用网络进行学习

③网上交往拓展人际交往圈                ④在网上不可能交到知心朋友

设M是椭圆$\frac{x^2}{25}+\frac{y^2}{16}=1$上的一点，$F_{1,}{F}_2$为焦点，且$\angle F_{1}M{F}_2=\frac{\mathrm{\pi }}{6}$，则$△M{F}_1{F}_2$ 的面积为（   ）

    I had never had a birthday party before,so at my “ripe old” age.I decided to throw one for myself.About 20 people1that they were coming.I don't have a lot of money,but I spent more than2in the $1 store to buy decorations and plates.I had a tiny3in order to ford all of them.

    I sat,I4,and,although all of my “friends” had said they were coming,no one5!The celebration was supposed to6at 12 noon.Here it was,4:00 pm,and7,no one was here.The ice-cream cake was8,the food on the barbecue was burnt beyond9.I tried really hard not to cry.

    I decided to sit back and relax,reflecting on the10moments that I did have.All of a sudden,I heard a roar of an engine,just outside my front door.Mr.Kenny,apparently,did11he could to show up.I cried in his12,sawing,"I'm not worth anything!"He wiped away my tears,13me tight,and said the14words:"I will always be your friend!" The dark clouds in my mind cleared away at once.

    He had had so many challenges and difficulties over his past couple of weeks,but he15to come.As we sat outside under a blanket of clear blue skies,laughing and16,I felt that I was17.He appeared just before I wanted to give up on this18world.

    Yes,life is beautiful.Yes,there are some people who love each other for over 50 years.19 there are some of us who do not have those luxuries（福气）.However,never give up the20maybe it is round the comer.

今年，株洲某网站随机抽取了540名中小学生，进行上网情况调查，结果如下表。请你对表中提供的信息进行比较分析，写出你得出的结论。