2022英语周报高二新课程17期答案

第三节One possible version:Paragraph 1Steve and Zach hadnt gone far uhen there toas afamiliar bark. Brady came bounding, stopped directly infront of Steve and hit him with his head, pushing him backtowards the slope. But Steve didnt get it. Then Bradygrabbed the boy4 Jeans and started pulling. The messagewas clear, but Steve hesitated. Of course he rememberedBrady saving his unele's life when the dog was much younger.Was he still sharp enough to get them through this?Paragraph 2Brady pulled again, in spite of the boys disbelief, iurgently. OK, big guy, "seeing the fire was touchingunderbrush nearby, Steve made up his mind.Brady ledthem back down the slope and into the trees. Several timesthe big dog stopped. Often he changed directions to find theright way. The boys were so tired but the dog bullied bothboys to go on. Steve was almost numb when he heard itthe wonderful sound of rushing water! They made it back tothe river

2.【命题意图】本题考查直线的参数方程、曲线的极坐标方程、直线与圆的位置关系;考查数学运算、数学抽象的核心素养【解析】(1)曲线C1的参数方程为消去参数得y=√4-x(x≥0),所以曲线C的直角坐标方程为x2+y2=4(x≥0,y≥0)(2分)由p(cos+sin0)=a及 pcos 8:=x,psin6=y得曲线C2的直角坐标方程为x+y-a=05分)(2)因为射线b=(P>0)与曲线C1及曲线C2交于同一点A且曲线C,C2都关于射线b=(P>0)对称,所以曲线C与曲线C2另一个交点B就是射线O=(p>0)与曲线C1的交点,因为0B=2,所以点B的极坐标为22410分)6

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