2022九年级英语周报7答案

参考范文Then, clutching (5mff)the tin can, he headed for the shop. " Ihave the money. " he seriously told the owner. The man went to thewindow and fetched Reubens treasure, He wiped the dust of it andgently wrapped it in brown paper. Then he placed the parcel inReuhen's hands Racing home, Reuben burst through the front door.His mother was cleaning the kitchen stove. "Here, Mom! HereReuben exclaimed as he ran to her side. He placed a small box in herwork-roughened haHis mother unwrapped it carefully, to save the paper. A bluepaper box appeared, and she lifted the lid. In gold lettering on a pair ofred, lambskin gloves was the word Mother. And a card says,"It isMothers Day. We appreciate all the things that Mom does for usThank you! "His mother had never received such a gift; she had nogift except her wedding ring. Spccchlcss, she smiled sweetly andgathered her son into her arms, with tears running down her cheeks.Long live with this happy moment!

15.【命题意图】本题考查抛物线的几何性质,考查学生运算求解能力【解析】抛物线y=2px的准线方程为设A(x1,y2),B(x2,y2),不妨设A在x轴上方,B在x轴下方,过点A作准线的垂线AH,如图y抛物线的定义可知,|AF=AH=6,所以x1+=6所以x1=6-2当AB的斜率不存在时,不满足题意,当AB的斜率存在时,设直线AB的方程为=k(x-1)(k≠0),=k(由得k2x2-(2k2+2p)x+k2=0,所以x1x2=1,x2=1所以y2=-2、12-p所以△OBM的面积S=1y1×1=2×212-p,得p=4.答案:4【易错提醒】由△OBM的面积是当列出等式,如果不能利用|AF|=|AH|=6=x1+2,会导致求解过程繁杂

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