First, multiple-choice questions (5 points for each question, 17 questions, ***85 points)

1. Generally speaking, the first few questions are easy. You can put four options in the question to see which answer matches and which is the correct answer.

2. According to statistics: 17 multiple-choice questions, the number of times that any option of ABCD becomes the correct answer is 3-5 times.

(1) You can't write a single question, you must answer all the questions. You can't write all the same answers, so you won't get any points.

(2) I can only write 1-2 questions, and the rest 15 questions have different answers, so I can get at least 20 points. For example, if you can write a question and choose a question, you can write C or D for the question that 15 doesn't know how to write it.

(3) Know how to write more than three questions, see which option of ABCD appears less frequently in the answers you know how to write, and then write that option on the questions you don't know how to write, so you can get at least 30 points.

Fill in the blanks (4 points for each question, 4 questions, *** 16 points)

It is generally possible that the answer to one of the questions is 0, 1, 2. In fact, you can't write every question. You can write 0 or 1 or 2 for all four questions, but the probability of writing 1 is higher than that of writing 0 and 2. If you have enough time, you can try to put 0, 1 2 in a question whose answer may be an integer. If you are lucky, you can answer one or two questions correctly.

Iii. Answering questions (49 points)

Don't give up the score of the solution if you don't understand it at all. The characteristic of the solution is to solve it layer by layer and finally get the answer. Steps to solve the problem.