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全國100所名校高考模擬金典卷文科政治Y

12.ACD【命題意圖】本題考查直線與圓和橢圓的位置關系,，涉及直線的斜率、圓的標準方程與幾何性質,、橢圓的離心率,，體現(xiàn)了直觀想象、邏輯推理,、數(shù)學運算等核心素養(yǎng),。【解析】由題意知kw·(）=-1,所以ko-子在圓A中,，因為OA=AD,所以∠DAx=2∠DOA,則mL4=m2∠01,，所以d-號解得.1mLD0A=號或an∠D01=-2(舍去)，所以a0-2,故A正確.設A(m,0)(m>0),則圓A的方程為(x-m)2+y2=m2,所以點A到直線BC的距離d=13m-5-1ml.化簡,，得16m+30m-25=0,解得m=號15】√32+47(負值已會去),，所以圓A的方程為-名)+-點。故B錯誤易知4（日,，0）,，所以由點斜式可得直線D的方程為y=氣：-8)，放C正確,，設橢圓E的方程為手-1(o>60).B(k).C),w,則手01①等-1@①-2.得,，0a262理利告器-x1-x24’x1+x22所以子則-所以a

全國100所名校示范題答案

第四部分寫作第一節(jié)One possible version:Dear Friends,As the weather is getting colder and colder,it's hard for the stray cats and dogs to look for food,sowe are starting the campus cat and dog food donation.This is how you can participate.You can bring youritems for donation to our donation location which is located in the hall of the campus library.Just drop offthe items there during usual library hours from January lst to 23rd.The donated food should be likecanned meats and ham sausages.We will distribute the food to some stray cats and dogs in ourcommunity.We truly appreciate your help.Many blessings,Joanna

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