填空the students took the PISA test（ ）(third) subjects---reading,maths and science.请说出理由
问题描述：
填空the students took the PISA test（ ）(third) subjects---reading,maths and science.请说出理由
答
填three
句子的意思是：学生们参加了PISA测试的三个科目---阅读,数学和科学.
括号后的subjects用了复数,前面应该是数词修饰表数量.这道题考的是序数词转化为基数词