英语周报2022-2058高二外研版49期答案

短文改错Today I experienced my neighbor kindness, We used to just wave or say"hi"A each other. This week there was atodownpour of rain in our area but flood warnings had been issued(*1F). As fiercer wind had been blowing all the day, partfierceof my fence had come down and the planks(t&) had been fallen down. I had been thinking of getting it repairing for therepairedlast two days, wondering what I could turn to for help. To my surprised, today through my window I saw it wasfixed. And the planks were well-connected and nailed up all the way to her small door. This was a very kind act by myneighbor and I was deep moved by the kindness.deepl

18.解:(1)∑xy=1×55+2×68+3×80+4×92+5×100=1299x=3,55+68+80+92+100395分5x=1+4+9+16+25=551299-5×3×79114=1142分55-5×3a=79-114×3=44.83分y=114x+448…“……当x=6时,114×6+448=113.2,即预测2020年一年内该乡镇约有113贫困户脱贫……5分∴预测6年内该乡镇脱贫总户数有55+68+80+92+100+113=508>500即预测到2020年底该乡镇500户贫困户能全部脱贫…6分(2)由题意可得:按分层抽样抽取的5户脱贫户中有1户五保户a,1户低保户b,3户扶贫户c,d、e7分从这5户中选2户,共有10种情况:(a,b),(a,c),(a,d)a,e)、(b)、(d),(b,e),(c,d),(c,e),(d,e)………9分记2户不都是扶贫户为事件A,则事件A共有3种情况:(c,d)(c,e,(d,e)11分101010g高考倒计时求抽取的2户不都是扶尺的概学………12分10

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