[安庆二模]安徽省2022年安庆市高考模拟试题(二模)文科综合答案

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19.[命题立意][文]考查线面垂直,面面[章]垂直,二面角;考查[来]直观想象,逻辑推理[自],数学运算的核心素[知]养[试题解析](1[嘛])证明:因为PD⊥[答]底面ABCD,BC[案]C底面ABCD,所[网]以PD⊥BC又CD[文]⊥BC,PD∩CD[章]=D,PD,CDC[来]平面PCD,所以B[自]C⊥平面PCD(1[知]分)又DMC平面P[嘛]CD,所以DM⊥B[答]C(2分)因为底面[案]ABCD为正方形,[网]所以AD=CD所以[文]在△PCD中,PD[章]=CD因为M为PC[来]的中点,所以DM⊥[自]PC(3分)又PC[知]∩BC=C,PC,[嘛]BCC平面PBC所[答]以DM⊥平面PBC[案],(4分)又DMC[网]平面DNM,所以平[文]面DNM⊥平面PB[章]C(5分)(2)以[来]D为坐标原点,AD[自],DC,DP所在直[知]线分别为x轴、y轴[嘛]、z轴,建立如图所[答]示的空间直角坐M标[案]系,设PD=1,N[网](A,10),则A[文](1,0,0),B[章](1,1,0),P[来](0,0,1),M[自](0,1Dy1),[知]所以A下=(-1,[嘛]0,x1),AB=[答](0,1,0),D[案]=(,1,0),D[网]=(0,2,2)([文]6分)(6分)设平[章]面PAB的法向量为[来]m=(x1,3y1[自],z1则m·AB=[知]0,即x1+z1=[嘛]0,y1=0令x1[答]=1,可得m=(1[案],0,1),(8分[网])设平面DNM的法[文]向量为n=(x2,[章]y2,22),Ax[来]:+yu022n·[自]D=0,少+令x2[知]=1,可得n=(1[嘛],-A,A),因为[答]平面DNM与平面P[案]AB的夹角为30,[网](10分)1+入2[文],解得即所以×√1[章]所以当N为线段BC[来]的中点时,平面DN[自]M与平面PAB所成[知]锐二面角的大小为3[嘛]0°(12分)椭圆[答]的方程,抛物线的方[案]程,直线与椭

第三部分写作第一节[网]【写作指导】审题本[文]题属于应用文写作中[章]的邀请信立意写作时[来]使用第一人称和第二[自]人称,时态以一般将[知]来时为主首段陈述写[嘛]邮件的目的;中间段[答]介绍讲座的写作时间[案]、地点和内容,并说[网]明邀请理由;最后思[文]路几谋篇一段表达期[章]待布局冂注意:考生[来]也可以灵活安排每段[自]的写作内容,但不可[知]以遗漏要点推荐根据[嘛]构思好的提纲确定写[答]作可能用到的表达,[案]表达to: invite, attend a lecture, waste food, raiseone' s awareness[网] of等【佳作展台】[文]Dear MikeI am writing to invite you to attend a lecture about Clear Your plateThe lecture is to be held in our school hall at 2: 30 pm nextThurs[章]day. It will be given by our headmaste[来]r, who will tell us the reasonsfo[自]r launching[知] the campaign.[嘛] Besides, he will talk about various activitie[答]sto be carried out which are aimed at raising students awareness[案]of savingI think the lecture can help us have a better understan[网]ding of the campaigna[文]nd form the habit of saving.i do hope you can join me. Please write back soonYours[章].Li hua亮点梳理】本[来]文开篇点明写邮件的[自]目的,接着详细介绍[知]了此次讲座的相关情[嘛]况,最后表达期望,[答]内容完整,语勺流畅[案],同时使用了亮点词[网]汇和句子。亮点词汇[文]:atnd, launch, carry out, be aimed at, raIse one'sawarenes[章]s of, have a better understan[来]ding of =o亮点句式:①非[自]限制性定语从句 who will tell us the reasons forlaunch[知]ing the campaign②[嘛]强调句 i do hope you can join me