VOA慢速英语:A High School Offers Single-Sex Classes to Top Students

keep their mind on专心于

例句：You must keep your mind on your work.
      你必须专心工作。

keep apart(使)分开

例句：You'd better keep the two aggressive boys apart.
      你最好把那两个好斗的男孩分开。

      I don't like to mix business with pleasure, but try to keep the two things fairly apart.
      我不爱把做生意和娱乐这两件事混为一谈, 而是设法把这两件事严格地区分开来。

2.His ninth-grade English class for boys centers on books that he believes boys find interesting.

center on重点在于…; 主要与…有关

例句：All his attention has centered on that experiment.
      他的全部注意力都集中在那个实验上。

      He centered his attention on the problem.
      他把注意力集中在这个问题上。

3.They're novels that deal with the arrogance of man and the pride of man which is ultimately man's downfall.

deal with论述, 涉及

例句：This book deals with life in the United States.
      这本书谈的是美国的生活情况。

      The subject isn't very well dealt with in this book.
      这本书里这问题讲得不太好。

4.Instead of just doing work sheets about it, this is a lot more fun.

a lot修饰比较级

可修饰比较级的词

1)a bit, a little, rather, much, far, by far, many, a lot, lots, a great deal, any, still, even等

2)还可以用表示倍数的词或度量名词作修饰语。

3)以上词(除by far)外，必须置于比较级形容词或副词的前面。