单选题 According to the passage, the task of education is fairly complicated because ______.

A、 the current public school system is too complicated to be understood
B、 the public school system has no choice of what to teach
C、 it is difficult to decide whether elementary science should be taught in public schools
D、 the educators should take care of both ordinary and gifted students

【正确答案】 D

【答案解析】文章的第一句话，用了一个虚拟语气，大意是说，假如能把少数有天赋的学生与其他众多一般的学生分开教授，那么我们的工作会相当的简单，显然暗示了教育工作的复杂是由于教育者必须兼顾智力一般的学生和天分极高的学生。故应选择D。