阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的词或使用括号中词语的正确形式填空。

    Hello! My name is Messias and I ____ (life) in Brazil. I am 10 years old and ____ (finish) school in four years. Kids go to school from 7 years old to 14 years old ____ my country. In Brazil we have only 4 hours of school a day. We have school uniforms that include T-shirts with the ____ (school) name on. Here are some more facts about ____ (I) country. Brazil is the world's ____ (great) grower and exporter of coffee. Everyone in Brazil ____ (like) soccer and there is a stadium in every city. 3/4 of Brazilians like to live in cities, and most of the cities are on the coast. I live in the capital of Brazil, Brasilia. It is in the ____ (central) of Brazil. When I walk to school each day, I see many food stands selling pineapples, melons, ____ (grape) and other fruit. In Brazil we speak Portuguese (葡萄牙语). ____ (sad), 60% of Brazilian homes have no toilets, 52% have no waste collection, and 70% have no running water.

（Ⅰ）求证：f（x）≥5；

（Ⅱ）若对任意实数x，15﹣2f（x）＜a²+ $\frac{9}{a^2+1}$ 都成立，求实数a的取值范围．

阅读下面文字，根据要求作文。

        网上购物，视频聊天，线上娱乐，已成为当下很多人生活中不可或缺的一部分。

        业内人士指出，不远的将来，我们只需在家里安装VR（虚拟现实）设备，便可以足不出户地穿梭于各个虚拟场景：时而在商店的衣帽间里试穿新衣，时而在诊室里与医生面对面交流，时而在足球场上观看比赛，时而化身为新闻事件的“现场目击者”……．

        当虚拟世界中的“虚拟”越来越成为现实世界中的“现实”时，是选择拥抱这个新世界，还是刻意远离，或者与它保持适当距离？

        ​对材料提出的问题，你有怎样的思考？写一篇论述类文章。

【注意】①角度自选，立意自定。②标题自拟。③不少于800字。④不得抄袭，套作。