填空题

According to a recent survey, four million people ______(死于说吸烟有关的疾病) each year.

【参考答案】

die of diseases linked to smoking
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填空题
By practicing these, I have been able to ______(在智力方面我一直能不断进步).
单项选择题
Meeting foreign language requirements for the Ph. D. ______.
A. is the most frequent reason for dropping out
B. is more difficult for the science candidate than for the humanities candidate
C. is an essential part of many Ph.D. programs
D. does not vary in difficulty among universities
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