3.A【解析】本题考查平面向量考查运算求解能力由a⊥b可知3x11)-2x=0,解得工=-3,故la=22

参考范文:Soon, Mr Lim's business became better and better with the help of his eldest son. He often helped his fatherwith his work. This boy was very good with his hands. He proved very popular with his customers. It was hewho expanded his fathers business after he dropped out of school when his father needed his help in their grow-ing bicycle business. He started a motorcycle repairing service to add on to his fathers trade Business at MrLims shop took off like a rocket and they soon lived a good life.It was at that time that my fathers business took a turn for the worse. One day, his senior assistant ranaway with a large number of the shop's earnings, which led to my father's being in debt. My father then sold ourfamily car to pay off the increasing bills. They say that one good deed deserves another Mr lim, came to learn ofour situation and stepped in to help. he stated simply that it was his turn to repay the kindness that my fatherhad shown to him in the past. With his generous help, my father's business gradually returned to normal

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