题目

 -- Would you like some coffee with milk? ---- ___________.    A .Yes, I would                         B. No, I wouldn’t    C. Yes, please                          D. Yes, I’d love 答案：C20．已知平面α，β和直线a，b，l满足α∩β=l，a?α，b?β，a∩b=A，求证：A∈l．