英语周报2021-2022北师大答案

语法填空1 is 62. better 63. to analyze 64 out 65 surroundings 66. where 67. that/ which 68. similarly69, to 70, recorded

a A得x2=(A =A2 22.解:(1)由x2 2=y 2,则y又x 1≥2或从1≤一2,所以C的普通方程为y=x2-2,x∈(-∞,-2]U[2, ∞)(3分)由p=1,得p2=1,令p2=x2 y2,则x2 y2=1,故C2的直角坐标方程为x2 y2=1.(5分)(2)由题意可知直线l经过圆C2上的点P(-1,0),且倾斜角为a,A(2,2),B(-2,2)当0

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