Hello everybody! I'm Hang. Today I will be your teacher. prior to the lesson, I have one small question for you "of you like coca or pepsi" following so we can go watch one video
make them ask why I choose this video 2? simply, because these are two popular drinks firms have different competition, of us who know the source of pepsi not? may raise their hands. I would like to reveal pepsi derived from coca. And now they are competing as two independent firms. This is just one example of the competition. for better understanding, we will come to the lesson today. Today we will learn about ...
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