1．目前社会上存在着迷信文凭的现象
2．造成这一现象的原因
3．我对此的观点

A．built three libraries for Congress
B．built three libraries at his home
C．donated books for three libraries
D．collected books from three libraries

A．There were laws that protected the rights of slaves.
B．Nobody in the U. S. disagreed with slavery before 1800.
C．There was progress in the opposition to slavery.
D．The end of the Civil War enabled blacks to enjoy equality