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根据下面资料，回答题： Proper an-angement of classroom space is important to encouraging interaction．Most of ushave noticed how important physical setting is to efficiency and comfort when we work．Today' scorporations hire human engineering specialists and spend a great deal of time and money to makesure that the physical environments of buildings are fit to the activities of their inhabitants．
Similarly, college classroom space should be designed to encourage the activity of criticalthinking．We will move into the twenty-first century, but step into almost any college classroomand you will step back in time at least a hundred years．Desks are normally in straight rows, sostudents can clearly see the teacher but not all their classmates．The assumption behind such an arrangement is obvious:everything important comes from the teacher．
With a imagination and effort, unless desks are fixed to the floor, the teacher can correctthis situation and create space that encourages interchanges among students．In small or standardsized classes, chairs, desks and tables can be arranged in different ways: circles, U-shapes, orsemicircles．The primary goal should be for everyone to be able to see everyone else．Larger classes, particularly those held i．n lecture halls, unfortunately, allow much less flexibility．
Arrangement of the classroom should also make it easy to divide students into small groups fordiscussion or problem-solving exercises．Small classes with malleabledesks and tables present noproblem．Even in large lecture halls, it is possible for students to turn around and form groups offour to six．Breaking a class into small groups provides more opportunities for students to interactwith each other, think out hard, and see how other students' thinking processes operate--all theseare the most important 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 samesmall groups throughout the course．A colleague of mine allows students to move around during thefirst two weeks, until they find a group they are comfortable with．He then asks them to stay in thesame seat, with the same group, from then on．This not only creates a comfortable setting for interaction but helps him learn students' names and faces．
The expression "step back in time at least a hundred years" ( Para．2 ) is intended to convey the idea that_________ A．college classrooms often remind people of their college life
B．critical thinking was encouraged even a century ago
C．a hundred years ago, desk arrangement in a classroom was quite different
D．there is not much change in the college educational idea over the past hundred years
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