Which is the second layer from the bottom in Open System Interconnection Reference Model?（）.
Many students find the experience of attending university lectures to be a confusing and frustrating experience. The lecturer speaks for one or two hours, perhaps (36) the talk with slides, writing up important information on the blackboard, (37) reading material and giving out (38) .The new student sees the other students continuously writing on notebooks and (39) what to write. Very often the student leaves the lecture (40) notes which do not catch the main points and (41) become hard even for the (42) to understand.
Most institutions provide courses which (43) new students to develop the skills they need to be (44) listeners and note-takers. (45) these are unavailable, there are many useful study-skills guides which (46) learners to practice these skills (47) . In all cases it is important to (48) the problem (49) . actually starting your studies.
It is important t
A. evaluate
B. acquaint
C. tackle
D. formulate
Marriage is still a popular institution in the United States, but divorce is becoming almost as "popular". Most American people get married, but at the present time, fifty percent of American marriages end up in divorce. However four out of five divorced people do not stay single. They get marriages a second time to new partners. Sociologists tell us that in the next century, most American people will many three or four times in one lifetime. Alvin Toffler, an American sociologist, calls this new social form serial marriages. In his book Future Shock, Toffler gives many reasons for this change in American marriage. In modern society, people’ s lives don’ t stay the same for very long. Americans frequently change their jobs, their homes, and their circle of friends. So the person who was a good husband or wife ten years ago is sometimes not as good ten years later. After some years of marriage, a husband or wife can feel that their lives have become v
A. A social practice.
B. A social organization.
C. A state law.
D. An established habit.
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