8.B设双曲线C的半焦距为c,则点F1(-c,0),由题意知PF2⊥x轴,所以点P的横坐标为c,由双曲线的对为(02)所以M=(,-2),(22一1所以点、)所以点M的坐标称性特点不妨设点P(c,y0)(y>0),所以2),故MF,M=(-c,-2)·(0,=B)=12,所以a2=62,所以a=b.所以双曲线C的渐近线方程为y=x.故选B

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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