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问题 选择题

用配方法将二次三项式a2+4a+5变形，结果是（　　）

A．（a-2）2+1

B．（a+2）2+1

C．（a-2）2-1

D．（a+2）2-1

答案

∵a2+4a+5=a2+4a+4-4+5，

a2+4a+5=（a+2）2+1．

故选B．

口语交际，情景问答题

根据下面的文字和图表，在横线处填写相应的文字。

根据下列文字和图表，在横线处填写相应的文字。

心理学实验显示，知晓自己的成绩的人，比不知晓者学习的动机较强。美国心理学家布克和诺非尔将两组学生作为实验对象，在前九天，A组知道自己的成绩，B组不知道，从第十天起，再用相反的方法对两组学生进行实验，结果证明①                。可见②                             。（都限25字以内作答）
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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.

All the following statements are true according to the passage except that ______.

A. new kinds of desks and chairs should be made
B. many companies are trying to improve the working settings for their employees
C. classroom interaction between students is essential to the training of critical thinking
D. a comfortable environment leads to higher working efficiency
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