Well, if you are a liberal arts student, you'd better fill in the blanks and choose 18 for about 45 minutes. The time for the big topic 123 is about 30 minutes, and there can be no more. The rest of the time to overcome two big problems, the first two small problems of big problems will not be too difficult. The last two questions may be difficult to fill in, and the rest of the time can be spent on these topics.

In science, the most basic thing is to master it as soon as possible. As a liberal arts student, I can't give detailed advice.