单项选择题

I remember being a student teacher in 1974, sitting for two weeks in the back of my cooperating teacher"s classroom watching her teach carefully before I had my chance to try. Her lessons flowed 1 from beginning to end, leading me to believe that teaching would be easy. I remember how 2 I was the first time I stood in front of 25 ninth-graders and attempted to teach them Spanish. My lesson wasn"t awful, but it was far from graceful and 3 . Teaching is a highly complex 4 and only the teacher who is very skilled can make it appear so simple.
How do effective teachers 5 the skills that make their lessons appear easy and appropriate for all students in the class 6 , a lot can be learned from attending university classes, 7 conferences and workshops, reading professional literature, 8 experienced teachers, discussing 9 and ideas with others and, of course, reflecting 10 one"s own teaching. However, some of the most important lessons that teachers learn do not come from these standard 11 —they come from the students themselves.
Most students are probably not aware of the important role they 12 in the training of teachers. However, to the wise teacher, the classroom is a 13 in which various approaches and strategies are 14 and refined and in which students communicate, in clear as well as subtle ways, whether a lesson was a success, a failure, or 15 in between.

A.anywhere
B.everywhere
C.somewhere
D.nowhere