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John and Jack were good friends. They were kind to each other. But sometimes they __小题1:___ (argue) with each other .One day they went boating in a park together . At noon, they were very hungry and then went into a restaurant ___小题2:____ (have) a dinner .As soon as they sat at a table, a waiter came up to them and asked, "What would you like ___小题3:___ (have)?" "We want two apples first," said John .As soon as the two apples ___小题4:__ (put)on the table, Jack took the bigger one in his hand. "You are too impolite, Jack .Why not take the smaller one first?" John said angrily. "But I did right. "said Jack with a smile, "If I let you take first, which one will you choose? " "Of course I __小题5:___(choose) the smaller one first?" said John. "Yes," Jack said, "If you ___小题6:___(take) the smaller one first, the bigger one will be left and it is still mine .Don't you think so?" "Ah......" John couldn't answer.

某商厦销售VCD机，在门口广告牌上写明：“凡在本商厦购买VCD机者，返给总价款3%的回扣，介绍推销者给付总价款1%的佣金。”该广告被人发现后举报到有关部门，经调查发现该商厦给付的回扣、佣金、账面上均已明确记载。据此，商厦的给付回扣、佣金的行为是下列何种性质?

A.不正当竞争行为

B.变相行贿行为

C.正当的促销交易行为

D.降价排挤行为