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问题 单项选择题

近年来，我国加快推进收入分配体制改革，调整收入分配格局，缩小城乡居民收入分配差距。下列措施有利于缩小城乡收入差距的有（）

①限制农村劳动力外出，大力发展农业生产

②落实各项惠农政策，增加财政支农投入

③提高农民在土地增值收益中的分配比例

④提高居民收入在国民收入分配中的比重

A.①②

B.②③

C.①④

D.③④

答案

参考答案：B

问答题

如图所示，质量为M的滑块B套在光滑的水平杆上可自由滑动，质量为m的小球A用一长为L的轻杆与B上的O点相连接，轻杆处于水平位置，可绕O点在竖直面内自由转动．

（1）固定滑块B，给小球A一竖直向上的初速度，使轻杆绕O点转过90°，则小球初速度的最小值是多少？

（2）若M=2m，不固定滑块B，给小球A一竖直向上的初速度v0，则当轻杆绕O点转过90°A球运动至最高点时，B球的速度多大？
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单项选择题

Proper arrangement of classroom space is important to encouraging interaction. Most of us have noticed how important physical setting is to efficiency and comfort in our work. College classroom space should be designed to encourage the activity of critical thinking. We may be approaching the twenty-first century, but step into almost any college classroom and you step back in time at least a hundred years. Desks are normally in straight rows, so students can clearly see the teacher but not all their classmates. The assumption behind such an arrangement is obvious. Everything of importance comes from the teacher.
With a little imagination and effort, unless desks are fixed to the floor, the teacher can correct this situation and create space that encourages interchange among students. In small or standard-size classes, chairs, desks, and tables can be arranged in a variety of ways. The primary goal should be for everyone to be able to see everyone else. Larger classes, particularly those held in lecture halls, unfortunately, allow much less flexibility.
Arrangement of the classroom should also make it easy to divide students into small groups for discussion or problem-solving exercises. Small classes with movable desks and tables present no problem. Even in large lecture halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides more opportunities for students to interact with each other, think out loud, and see how other students’ thinking processes operate all essential elements in developing new modes of critical thinking. In courses that regularly use a small group format, students might be asked to stay in the same small groups throughout the course. A colleague of mine, John, allows students to move around during the first two weeks, until they find a group they are comfortable with. John then asks them to stay in the same seat, with the same group, from that time on. This not only creates a comfortable setting for interaction but helps him learn students’ names and faces.

The author mentioned John in Paragraph 4 in order to ______.

A. describe a good seat-arrange mode in courses with small group format
B. give an example that students stay in the same seat throughout the course
C. create a comfortable setting for interaction
D. learn students’ names and faces
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