4
回答
我觉得5个选项都不能证明文章中的结论是错的。难道我理解题意有问题吗?这道题应该怎么解释呢?
In a freshman biochemistry class at Newton University, the teacher assigns the class only ‘A’s, ‘B’s, ‘C’s. The average on the semester final for the class of 2012 was five points lower than that of the class of 2011. Therefore, the percent of students who received ‘C’s was greater in 2012 than in 2011.
Which of the following, if true, suggests the conclusion above is not necessarily valid?
a. There was a greater number of students in the 2011 class than in the 2012 class.
b. The percent of students who received ‘A’s in 2011 was less than in 2012/
c. Five more students received ‘A’s in 2012, then in 2011.
d. The same number of students received ‘B’s in 2011 as in 2012.
e. The percent of students who received ‘B’s was greater in 2012 than in 2011.
我个人理解 这题有一个隐藏的前提是,2012年的班级人数和2011年的班级人数一样多,所以在D 得情况下, B的人数=B的百分比一样多,那么2011人分数高,所以2011班级里面得到A的人数多,2012年班级里面得到C的比较多。
I agree with you. Only information with both A and B score can suggests whether the conclusion is valid or not. And none of the five options provided such information.
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