something happened today

there is a lecture this morning. I met a question in the lecture. i met a word"1900s", I don't know how to pronounce it. If it is like 1930, I know it is nineteen thirty. But what about "1900"? nineteen zero or nineteen zero zero, or ninetten OO?

Something Happened Today

There was a lecture this morning. I came across a problem in the lecture. I heard the word "1900s," but I didn't know how to pronounce it. If it is like 1930, I know it is "nineteen thirty." But what about "1900"? Do you say "nineteen zero" or "nineteen zero zero," or "nineteen oh-oh"? 

... It's "nineteen hundreds."

"I met a question" sounds strange in English. Did you mean 遇到一个问题 or something like that? 问题 does not always mean "question" in English. In your sentence it should be "problem." Also, you can't use "meet" like this in English. Generally speaking, in English, you "meet" a person. You can't meet a thing and you can't meet a word. You have to use different words to describe that.