偏向力
参考答案：
柯氏力只能改变空气运动的方向，不能改变其速率，所以称它为偏向力。
请开始答题：(共15小题)
4278（）
A.A
B.B
C.C
D.D
This year he has made great _____ with his English.
He feels proud of it. [ ]
A. achieve
B. improvement
C. progress
D. progresses
