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7.A【解析】甲、乙、内对应的植被依次是森林、草原、荒漠，原因是由沿海向内陆降水越米越少，A正确。8.A【解析】伊犁河谷位于南北天山之间，西风从大西洋带来的水汽受山地抬升形成降水，A正确。

Dear Charlie,Hearing that you are searching for a host family,I'm more than happy to invite you to come to my family.In my family,there are three members including my father,my mother and me.My father is a businessman,who is often on business.So he seldom stays at home.My mother is a math teacher,who is often busy with herwork.Therefore,I sometimes feel lonely.In my family there is a spare room.You can live in it.The room is veryclean and comfortable.If you come,we can study and play together.If you have math problems,you can turn tomy mother for help,which is very convenient.I am looking forward to your coming soon.Yours,Li Hua