题目

 — Can you tell me ________? — His home is quite far from the office, I think.              A. where he works                                 B. why he bought the car                C. when he got up                                 D. how he likes his job 答案：B已知，是不共线的向量，且=λ1+，=+λ2，（λ1，λ2∈R），若A、B、C三点共线，则λ1，λ2满足A.λ1=λ2=-1B.λ1=λ2=1C.λ1λ2-1=0D.λ1λ2+1=0