10.A【解析】由各项均为正数的等比数列(a}满足an+2as,可得a1q=aq5+2a1q,所以q-q-2解得q=2或q=-1(舍去)因为√ana,=4a1所以q+1=16,所以m+n=6,所以1+4(m+n)(1+)=吉(5+m+m)≥音x(5+4=3,当且仅当里纽即/m=2,时,等号成立故1+4的最小值为3,故选A

第三节书面表达One possible versionNoticeAs the 50th anniversary of the school is approachingour school has decided to organize the students to watch adocumentary about the history of the school. All international students are arranged to attend this event togetherwith Grade Three students at 3: 00 p. m. this Friday at No.One meeting hallgh the documentary, you can get a knowledge ofce auringrs, the contributions of the teachers and the achievenents of former students. I believe this is a good chance tohave a better understanding of the school as well as the development of Chinese educationPlease arrive early for better seats and write an articabout your comments and reflections after watching.The Students’ UnionSeptember 5th, 2020

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