题干
--- Would you please give me a hand and take the bookcase upstairs?
--- _______.
--- _______.
A：With pleasure
B：My pleasure
C：Of course I do
D：Yes, that’s all right
答案(点此获取答案解析）
B
=0”是“（x1，y1）、（x2，y2）、（x3，y3）三点共线”的（ ）