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第四部分写作第一节短文改错，中碧女个红，试西章中单Dear Amy,o时n,公什级知天的限出处How have you been recently?I have been heard thatyou have been addicted to social media since the beginningof the winter vacation,posted pictures regularly to sharepostingall the details of your life.Now I feel worried aboutmyyoursharing.的明家的It's quite understandable that you want to share yourlife with friends.Therefore,if you overshare,it may causeHoweveryou unnecessaryproblem.In my opinion,it's A waste of处problems[骨岛，西atime to spend too much time on social media,that makeswhichit hard for you to focus on other meaningful aspects of lifeAdditional,it will surely do harm on your eyesightAdditionallytostaring at the screen.So I strongly advise you to stopoversharing and communicate most with your friends inmorereal life.运雷累要需议出，授一肝生麻态和同返查Yours,同公合岸再胡亦题组一讯0：速毫东零Li Hua

5.D根据变量x,y满足的约束条件，可知目标函数之=x十2y在点(1,3)处取得最大值之=1+2×3=7.