题目：28． What has happened to students these years according to the passage
A． The students don’t have to think anymore．n school．
B． The students use calculators in math class．
C．The students used to walk to school，but now they don’t．
D．All of the above．
喵查答案：D
28.D【解析】由文章第三段可知，A、B、C三项均是学生的变化，故选D。
