影响课堂观察的因素是()
A．学习成绩
B．光环效应
C．期望效应
D．刻板效应
参考答案：A, B, C, D
-We call him Sam Green.Is Sam his family name?
-____________.[ ]
A. Yes,it is
B. Yes,he is
C. No,he isn't
D. No,it isn't
字义解释
