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So says倒装句型，强调so，该机构发表的报告的内容。so指代的是前面一句话：上学年有多少学生在美国的学校就读。
2.Doug Bennett has written several articles aimed at helping students choose a college that best fits their needs.
aimed at为了，目的是，相当于in order to。在这里是过去分词做状语，修饰articles。that best fits their needs是定语从句，修饰college。
3.He says one of the important things to consider is the size of a school.
to consider不定式做后置定语，修饰things。
4.We're that small because we think we educate much more effectively and much more powerfully because we stay small.
that small如此小，在这里相当于so small。
5.What kinds of activities are offered that might add to the educational experience?
add to增加,增添,补充
例句：This lesson adds to the value of the book.
这一课增加了这本书的价值。
Since then, the palace has often been added to, rebuilt and repaired.
从那以后, 那座宫殿不断得到扩建和修缮。
