You should say:
What it is
Have you ever used it
And why do you think it can change the world
思路分析：
Smart Phones
This is a great topic to choose because there are so many features of a mobile phone that you can talk forever about this. You can also talk about which features you use and why they are useful to you: camera, video, texting, calendar, weather, music player, GPS, web browser (shopping online, online banking etc)
The cue card mentions who invented it – you don't need to know this information. You can say "I do not know who invented it but some of the top selling brands are "Apple" etc. If you don't know when it was invented, you can say "I'm not exactly sure when it was invented but most people have been using them for the last decade at least."
Internet
Another great topic which allows you to take your talk in any direction you want: international business, social media (Facebook, Youtube, Twitter), globalisation, online education etc
TV
You can talk about: news, weather reports, films, soap operas, documentaries and education programs, escapism, relaxation, reality TV, chat shows etc
Modern Transportation
Cars, aeroplanes, trains. You can talk about each type as well as globalisation and tourism.
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