Haven't heard from you for a long time
Add one more sentence of very personal nature before coming to the point, such as;
I hope you are doing great with your studies.. Last time yoiu said you have to do a your professor requested you to study some recent hot news in Asia.
.... actually this professor's story is not important because your prompt does not indicate anything of that sort. Simply talk about his curiosity over knowing news in your country;
I thought of sharing some latest news of our country with you as you expressed your curiosity in knowing about us.As you know, chinese peoplebecomeare becoming richer now and they tend to look for some quality goods.
... Well I think,it is better you talk of some serious news such as political, social, sports etc.... That's how the prompt sounds :)