小题1:B
小题2:C
小题3:C
小题4:A
小题1:根据文章的第二自然段“President John Adams started the library in 1800 for members of Congress. He wanted them to be able to read books about law. The first 740 books were bought in England.”即约翰-亚当斯总统在1800年为国会议员建立图书馆，目的是让他们能读有关法律的书，最初的740本是从应该购进的。由此可以断定该题选B
小题2:根据“He (John Adams) felt Congress should have books on all subjects, not just on law. ”他认为国会应该欧各种各类的书籍，不仅仅是有关法律的书。由此可以断定该题选C
小题3:根据“He (John Adams) felt Congress should have books on all subjects, not just on law. ”他认为国会应该有各种各类的书籍，不仅仅是有关法律的书。此可以断定，选项A B D 是正确的，故该题选C
小题4:根据文章的大意可知，本文主要介绍了“the Library of Congress”的一些情况，从创立，经扩充，最后成为最大的图书馆。故该题选A