问题补充：
In our school, students are according to how much they know and how old they are.
A. classified
B. combined
C. listed
D. made
答案：
(答案→)A. classified
B. combined
C. listed
D. made
解析：词义辨析。 A．把……分类 B．使……结合；联合C列出；列于表上 D．做；安排。句意：在我们学校，学生被按照知道多少和年龄进行分类。故选A。
