12 multiple-choice questions (3 points) +5 fill-in-the-blank questions (4 points): 50-60 minutes; Four 8-point questions: 60 minutes
Note: There is no need to make choices and fill in the blanks in the exam step by step as usual. The answer can be quickly determined by using special value substitution method, exclusion method and graphic method. Of course, we must not be hasty, because two fill-in-the-blank questions can be worth a big question!