2022英语周报八年级31期答案

书面表达One possible version:Dear Jack,I am happy to know that you are to spend some time in China. I recommend you stay in Beijing, the capital andcultural center of China.First of all, there are a lot of museums where precious relics of historical interest are waiting for you toexplore. Besides, the exceptional Peking Opera performances there are also what you can t miss. And the city isalso best known for its abundance of ancient buildings, which are still well preserved.I hope that you will have a good time in China.Yours sincerely,Li Hua

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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