客户进货的付款条件主要取决于市场供求和商业信用两个因素。（）
参考答案：对
—Who is the man ______ by a group of students there?
—A professor _____ research on physics.
A．followed; did
B．following; did
C．followed; doing
D．following; doing
“你今天感觉好点了吧!”属于
A．封闭式提问B．开放式提问C．探索式提问D．倾向性提问E．复合式提问
