My mood

First of all, I'll (or 'let me') introduce myself to you. I'm Thomas, a student in of the university of China. Ok... Today I have had two classes today (unless you are writing before classes, but rest of the text suggests it's after). One is macroeconomics, and the other is international marking marketing. My teacher who teaches me international marketing is excellent absolutely (uh. Go with different order here, something like: My International Marketing teacher is absolutely excellent). I answered the question about carbon dioxide reduced (reduction, probably). Developed countries need to help developing countries in the area of technology. For the sake of our globe (world or planet actually would sound better. You can also add, if it pleases you, 'our only world/planet/globe' to emphasise urgency.), we should unite together ('we sould all unite', or 'come together'. 'unite together' is pleonasm). I'm so happy my point of view has been identity. (this last sentence makes little sense, this very nearly means, 'my point of view was person'.  You might wanna go with something like "so well received" or "appreciated" even, instead of "identity")

*Make sure to place *blank space* after the comma ',' or full stop '.' not before it. This can make a difference if you are submitting a CV in English.

Over all very good, it's clear what you mean, and there are no severe grammatical issues with it :)

My mood

First of all ,I introduce myself to you. I'm Thomas, a student in the university of China.Ok...Today I have two classes .one is macroeconomics,and the other is international marking.My teacher who teaches me international marketing is excellent absolutely.I answered the question about carbon dioxide reduced,Developed countries need to help developing countries in the area of technology.For the sake of our globe,we should unite together.I'm so happy my point of view has been identity.