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盐风化作用是因盐结晶膨胀而导致的岩石露头(注:地下岩体露出地表的部分)表面颗粒分解或脱落的物理风化作用。因盐风化作用,岩石露头表面(主要是侧面)易形成各种形态的风化穴。下图示意甘肃酒泉某地红色砂岩露头的盐风化穴,该地平均年降水量仅为84毫米。据此完成3~4题。3.下列不属于盐风化形成必备条件的是A.可溶性盐类物质B.含有孔隙的岩石C.坡度较陡的地势D.干湿交替的环境【答案】C【解析】根据材料可知,盐风化需要盐分结晶,需要可溶性盐类物质溶于水,在岩石孔隙中汇聚,随蒸发水分排出,盐分结晶,晶体生长撑破孔隙周围的表面颗粒而形成形态各异的风化穴;因此盐风化的形成需要可溶性盐类物质、含有孔隙的岩石和干湿交替的环境。地势陡缓对盐风化无明显影响。4.若该地红色砂岩四周年降水量相同,岩石的盐风化穴发育较明显的一侧是中出)A.偏西侧B.偏南侧C.偏北侧D.偏东侧案客【答案】B【解析】若该地红色砂岩山地四周年降水量相同,山地岩石四周含盐水分量相同,但山地南侧为向阳坡,获得的太阳辐射量更大,水分蒸发更强烈,盐分结晶膨胀作用强,盐风化穴发育较明显。
Dear Andrew,How nice to hear from you again!I think it is natural for you not to get used to the life there.Here I havesome suggestions for you.First of all,you should respect the local customs there and try to involve yourself in the natives'lives.Just asthe saying goes,"When in Rome,do as the Romans do."Secondly,don't be afraid to communicate withAmerican students and make friends with them.Friendship will bring you happiness.What's more,it is better foryou to join in more outdoor activities with your friends,which may help you relax and have fun.Finally,mindyour own manners and remain modest and honest when getting along with your friends.I do hope my suggestions will help you.May you adapt to your new life soon and enjoy your stay there.Yours sincerely,Li Hua