2022 八年级上册英语周报第二期答案

第二节One possible versionWhen Norah heard of her mothers plan, she was terhappy. She couldnt wait to see Dan at once. Hardly hadthey met Dan in his yard when Norah shouted excitedlyShe ran right up to him as if she had known him all of herlife and she was climbing all over him like a monkeyAnd of course every time I turned around. she d comeback over and hug me again, " Dan said. When it was timeto leave, Norah and her mom passed the rose bush by thedoor. Dan picked a big red rose and gave it to Norah, saying, "This is a symbol of our friendship.The mother and her daughter hane been visiting himceely, erer since. Every time they went there, the old andthe young would play games and tell each other secretsorah considers Dan as a family member and Dan has neverbeen alone again. "Norah helped me recover from my sad-ness and gave me something to live for, Dan said, with afresh shave and haircut

20.(1)由椭圆的定义知4a=81分2分从而b2=a2-c2=3.……3分椭圆C的方程为+2=1.4分2)设直线ANy=2x+4代人曲线C:+3=.化简得3x2-3tx+t2-3=0,5分设A(x1,y),N(x2,y2)由△>0得:2<12,x1+x2=t,x1x26分I AN I+|x1-x24+x2)2-47分3点O到直线AN的距离d=-48分1+∵直线AM过坐标原点,S△AMN=2S△Nt2(12-t2)4√310分≤12=23(当且仅当=12-2,即=6时,取“=”)/3△AMN面积的最大值为2√3……12分

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