正式评价指学生在相同的情况下接受相同的评估，如谈话、观察等。
参考答案：错
— How did your students express their thanks to you on Teachers’ Day?
— A gift, together with many flowers ____ sent to me by my students.
A．is
B．are
C．was
D．were
大黄升华成分主要是（）
A、蒽醌类
B、牡丹酚
C、苯甲酸
D、斑蝥素
