3.已知、是不共线的向量，，（、），则、、三点共线的充要条件是

     A. λ＋μ=1      B.λ－μ=1         C.λμ=－1        D.λμ=1

C.  　　　　　　 　D.

A.  　　　　　　　B.

2.已知,,,

1.设复数，（），若为实数，则等于

     A. －2        B. －1          C.1            D .2

ashamed as I was . they have been drinking grape juice too!                 85. had        

One possible version

Dear Mke ,

I’m glad to learn that you and your parents will come to Beijing for a two-day trip, and I’d like to serve as your guide.

Born and growing up in Beijing, I know the city quite well. Above all, I can speak English quite fluently,so we can commuincate with each other easily. I know you have been longing for a visit to the Olympic venues like the Bird Nest and the Water Cube, therefore, I’ll first take you there. On the next day we can go to the Forbidden city, whose splendid construction will surly catch your imagination. Of curse, you won’t be lose the chance to be on the Great Wall. In a word, you’ll have a good time with me as your tour guide.

 I am looking forward to your reply.

                                                Faithfully

                                                  Li Hua

本资料由《七彩教育网》www.7caiedu.cn 提供！

laer, I finally told the them the truth. And guess what ? They/\ just as          84. were        

as they did. To tell the truth, they never knew the difference. Years            83. √        

that it was wine. I tried to look just as crazy and out of the control            82. the        

myself. I solved this problem, by drinking fruit juice and pretend             81. pretending