invention of the mobile phone

Good morning, students. My name is Yana Olegovna. 
Do you have mobile phones? And does your parents and friends have them?
I'm sure yes. Most of people nowdays have mobile phones.
Nearly all will agree that they are necessary and very convinient, but are there any bad sides in using them?

Well, i think now it is a high time to learn about the invention of the telephone.
Read, please, the article.

And now, a few exersises.

Well, I have a question for you. Answer, please, in blog.

Test yourself

Thank you for your work. Good luck.