那些仅把思维局限于学员整体，却忽视学员整体中个体差异的教员犯了什么错误？ Thinking is limited to the trainees overall,but disregard the individual differences in overall,what wrong the instructor made?
A.采用一种很好的授课技巧 Use a very good teaching skill
B.采用一种极佳的省事手段 With an excellent save means
C.假定所有学员的水平相近 Assume similar level for all trainees
正确答案是C