In the last paragraph，the author mainly intends to
A．list the necessary changes we ought to make
B．advise US to make any necessary changes
C．explain what changes can bring
D． explain the process of making changes
正确答案：B
概括文章最后一段可知作者建议我们改变无所谓大小只要必要就需要改变A项是对文章的片面理解；C项是文章的细节不是段落的主旨
