问题
选择题
All the classes in this school _________ 60 students though they are of different ages。
A．are consisted of
B．consist of
C．is made upof
D．make up of
答案
B
题目分析：考查动词短语。句意 虽然他们年龄不同但他们每个班由60个学生。Consist of 由。。组成，无进行无被动。Be made up of 由 。。组成，主语是classes,故谓语动词用复数形式，所以选B项。
考点 : 考查动词短语