2022 英语周报 八年级 牛津 36答案

One possibleDear fellow studentsHow are things going with you? Im writing to offeryou some practical preventive measures to fight againstFirstly, to reduce the risk of infection, you shouldavoid people who have been infected with it. Secondlywash your hands often with soap and water for at least 20seconds. Thirdly, cover your mouth and nose when youough or sneeze. In addition, wear masks when going out hope you will do a good job in prevention and have aand keep the room clean and ventilated. Last but not leaderful time in Chinakeep a good state of mind.Yours sincerely,I hope the above tips will be of benefit to you. Also, I

8.C【解析】设a=(x,y),e=(1,0),b=(m,n),由b2-4e·b+3=0得m23=0,(m-2)2+n2=1因此,a一b的最小值朽圆小(2,0)到直线y=±3x的距离《。=√3减去半径1,为3-1.选C

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