Question 16 is based on the passage you have just heard.

听力原文

        Homework is an important part of schooling, but the purposes of giving children homework will change as they grow older. (16) [At the primary level, the main aim is to cultivate good habits, like learning to plan and exercising self-discipline.] During the secondary school years, extending what is learned at school is positively related to academic achievement. So the content of homework becomes more important.

        So how can you help your child do their best? (17) [Creating an ideal working environment will make it easier for them to get down to their assignments quickly.] Make sure it’s free of distractions, and for primary school children, at least, somewhere near you. So you can answer questions and offer encouragement. You probably have to help younger children plan their session, but it’s important that by the end of primary school, it’s second nature.

         Get them to tell you everything they have to do, then encourage them to establish an order in which they do work. (18) [When there are several different assignments, make sure they begin with one they enjoy.] So it seems easy to get started. It’s best to take on the most difficult task second, once they’re settled, but before they get tired. If older children have more than an hour of homework, encourage them to schedule a short break to stretch. If you encourage them to tell you what they’ve learned, they'll absorb the information more deeply and remember it more readily.

16. What is the main aim of homework for primary school kids?

解析：A。录音开头说到，随着儿童长大，家庭作业的目的也会发生改变，接着说到在小学阶段（At the primary level），主要目的是培养良好习惯，A项全部原词复现，故为正确答案。

错项排除：B项利用录音中的secondary school进行干扰，但录音中是说中学阶段的家庭作业的目的，并不是说小学生家庭作业是为中学做准备，故B项错误。C项的review what is learned in class利用常识进行干扰，但录音中并无此依据，故排除。D项主观臆断，故排除。