sat测验差官网站默读一题短简，当今是SAT1数学隔开。 Read the following SAT test question, then click on a button to select your answer. There are n students in a biology class, and only 6 of them are seniors. If 7 juniors are added to the class, how many students in the class will not be seniors? A.n – 3 B.n – 2 C.n – 1 D.n + 1 E.n + 2 Correct Answer: D Here's Why: At first, there are n students in the class, and 6 of them are seniors. It follows that initially n – 6 students are not seniors. If 7 juniors are added to the class, there will be n – 6 + 7, or n + 1, students in the class who are not seniors. Difficulty: Medium Question Type: Standard Multiple Choice
