2022英语周报九年级新目标(JXG)答案

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

9.D【解析】如图,设PF2|=m,则QF2|=3m,由双曲线的定义知|QF1QF2|+2a=3m+2a,PF1|=|PF2|+2a=m+2a,PF·PQ=0,知PF1⊥PF2,所以|PF1|2+PQ2=QF1|2,即(m+2a)2+(4m)2=(3m+2a)2,解得m=a,所以PF2=a,|PF1|=3a,由|PF1|2+|PF22F1F2|2,得9a2+a2=4c2,4即VF2

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