67. The author tells a story in Paragraph 1 to ______.

　　A. lead into the main argumentation

　　B. provide the historical background

　　C. show reasons for lecture absences

　　D. compare two different kinds of classes

　　68. What can we learn about the current lecture system?

　　A. Students take passive part in small discussion classes.

　　B. The professors need more room to present their talents.

　　C. Lectures are mainly intended for junior and senior students.

　　D. It is far from beneficial for those academically inexperienced students.

　　69. The underlined word “indispensable” in Paragraph 4 probably means ______.

　　A. common B. necessary C. available D. abundant

　　70. What is the best title for the passage?

　　A. College Lectures ： Graduates or Undergraduates?

　　B. College Lectures ： Advantages and Disadvantages

　　C. College Lectures ： Continue or Not?

　　D. College Lectures ： Today and Past

　　第二节(共5小题;每小题分，共分）

　　根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选 项中有两项为多余选项。

　　Potato chips, which are popular everywhere today, had an unusual origin. The snack came about because of a complaint and an argument. An American named George Crum is credited with inventing potato chips. 71 ______

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