海底地形中最深的地方是[ ]
A、大陆架
B、大陆坡
C、洋盆
D、海沟
答案：D
_______ of the students in our class _______ money to the quake-hit areas these days.
A．Two third; have raised
B．Two thirds; have raised
C．Two three; have donated
D．Two thirds; have donated
针对传统文献，信息描述就是文献的（），或称（）
