Elective course in the second national volume refers to a national college entrance examination paper like this in the second national volume, which contains an elective course book of mathematics, and then the elective course book of mathematics generally selects several classic examples and more important knowledge points to be examined in the formal college entrance examination paper.

Then multiple-choice questions like this are usually placed in the last part of the math test paper, and then in the multiple-choice book, the general teacher will choose several books to win the gold medal, and then the books examined every year are generally different.

So the final conclusion is this. This is what the national two-volume mathematics elective course means. The elective topics are generally classic, and then it will be more difficult to accept when explaining.