Hangzhou uses 38 sets of Tian Li. Everything is fine.

If you want to take the exam outside in the third grade, I suggest it is a paper from the science experimental class. It's a bit difficult, but there is a high probability of getting the same question in the exam outside. I have met several times. ...

You have used the ingenious ideas of various provinces and cities, as well as the research papers of various provinces and cities.

This is what I do, especially science. Very useful. I have read almost all the questions on the school paper, and even done them several times. ...