例3：Many teachers believe that the responsibilities for learning lie with the students... It is the ______responsibility to find books， magazines, and articles in the library.
A. student‘s B. professor’s C. assistant‘s D. librarian’s
【答案】A.从前面的responsibilities for learning lie with the students可以判断查找材料也应该是“学生”的责任，所以答案为A.
例4：Forcing yourself to recall (almost) never helps because it doesn't ____ your memory; it only tightens it.
A. loosen B. weaken C. decrease D. reduce
【答案】A.前后两部分互为解释，一为肯定，一为否定，为反义复现。从下文的tighten可以判断，上文应该是选loosen.
例5：There are four types of blood. _______ types are found in every race, and no type is distinct to any race.
A. All B. Most C. No D. Some
【答案】A.并列连词and说明前后语意一致，那么，前后应该是反义复现，与no 反义的自然是A (all) .
例5：Many teachers believe that the responsibilities for learning lie with the students. If a long reading assignment is given, the instructors expect students to be familiar with the (information) in the reading …When research is ______, the professor expects the student to take it actively and to complete it with (minimum) guidance.
A. collected B. assigned C. distributed D. finished
【答案】B.该部分作者通过两个例子说明，应该有学生负责自己的学习，都是从“布置作业”方面解释。说明布置阅读作业时要求学生如何;布置研究作业时又该要求学生如何。两个例子概念复现，借助于give reading assignment的表达方式， 可以确定答案应该是B， 构成assign research的结构。