14周后，在标准数学考试中，嚼口香糖学生的成绩平均提高了3%；在期末考试中，嚼口香糖学生的数学成绩也比不嚼口香糖的学生高。

After 14 weeks, students who chewed gum had a 3% increase in standardized math test scores and had final math grades better than the others.

youdao

14周后，在标准数学考试中，嚼口香糖学生的成绩平均提高了3%；在期末考试中，嚼口香糖学生的数学成绩也比不嚼口香糖的学生高。

After 14 weeks, students who chewed gum had a 3% increase in standardized math test scores and had final math grades better than the others.

youdao