2022英语周报高三第十一期答案

书面表达One posssible versionDear Mr. Smith,I'm Li Hua, a senior 3 student. Learning that your City Culture department is looking for an English editorthis summer, I'm eager to apply for the position.As far as I'm concerned, city culture refers to a citys history, geography, customs, future, and so on. Asa native, I am quite familiar with our citys traditional culture. Besides, I have a good command of ErI' m especially good at English writing. Additionally, Im cooperative and creative, which will give me anadvantage for the position.I'll be greatly honored if I' m chosen for the job. If I'm admitted, please email me at lihua @16com.Yours sincerely,Li Hu

6答案:4解:将x=0-2代入抛物线C的方程可得,y2-40 8=0,设4xy)B(x2,y2),从而,y1y2=8,设BD的方程为x=my 2,与抛物线联立得y2-4my-8=0,设E(xn,y0),从而yy2=-8,从而y1=-y0·根据抛物线的对称性可知,A,E关于x轴对称,所以过点A,B,E的圆心N在x轴上由上y0 y2=4m,有x0 x2=4m2 4,则BE=(x0 x2)-4x0x2 (0 y2)-4yy2=16m2 48m2 32.所以,线段BE的中垂线与x轴的交点(即圆心N)横坐标为2m2 4,所以a=2m2 4.于是,=ANF (2)=(2 2 (当2 m1 12 8代入x0 x2=4m2 4,yo y2=4m,得r=4m 16m2 12,所以m2 4)-(4m4 16m2 12)=4

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