第九期英语周报2022高考外研答案

号=D15.【答案】am=-2(n≥2，n∈N*)【解析】Sm=2a 1十1，①Sm-1=2am 1,n≥2，②①-②得：an=2am 1一2an,ae1=a,n≥2》，3义a=2a: 1,所以a=}≠924=4(1)所以an=n-2(n≥2，n∈N)

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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