题目内容
收藏
纠错
题目材料：
In a freshman biochemistry class at Newton University, the teacher assigns the class only `A`s,`B`s`or`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?
-
AThere was a greater number of students in the 2011 class than in the 2012 class.
-
BThe percent of students who received `A`s in 2011 was less than in 2012.
-
CFive more students received `A`s in 2012 than in 2011.
-
DThe same number of students received `B`s in 2011 as in 2012.
-
EThe percent of students who received `B`s was greater in 2012 than in 2011.
E显示答案
