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北京大学2006年博士试题及答案
Direction:
In each question decide which of the four choices given will most suitably complete the sentence if inserted at the place marked. Put the letter of your choice in the ANSWER SHEET. (20%)
21. The nuclear family______ a self-contained, self-satisfying unit composed of father, mother and children.
A. refers to B. defines C. describes D. devotes to
