2022-2022高二牛津英语周报答案

18.解:4考查面面平行及线角日为C∥AD,1=2B,E为线段AD的中点,所以比点AE,连接EC,因为AB⊥AD,所以国边形ABE为矩形,连接EE交点(),连接(x,阳略.因为G为线段PB的中点,所以GRO∥PE,因为(x平画PEF,PEC平面PEF,所以(x∥半面PEF.山送易知,AC∥平面PEF,又因为GOC平面GAC,AC平画(AC,ACn(=O,所以半PEF∥向GiLC(2)为PA⊥纸血ABD.AB⊥AD,所以AB.AD,AP两两垂白,故分别以AB,AD、AP所在直线为,,y,轴建立如图所小的空间角坐标系因为A=2-2PA-2,AB-1,所以t(,0,方),((1,1,0),D(0,2u,..所以=(…=(1:-1,=(0,-1设平面PCD的法向量为m=(x,y,:),所以今y-1,解x-1,=2,所以于面PD的一个这向最为(1,1,2没线(C与平商PCD所成的角为611-2>(所以san0VrTF2su+1-·故直线G与平面PCD所成角的正弦值为12分

Dear Mr. John,I'm really sorry about my using the mobile phone inyour lecture last week. Please accept my heart-felt apologyfor being so rudeI know any word might sound a made-up excuse. But Ididn't use the mobile phone for no reason. I was trying toapply to some American universities last week and that daygot an offer and they needed my further information immediately. Therefore, I had no other choice buthem a text message in class and that was exactly what Irwas doing when you discovered. I promise it will neverhappen ' again. But I do need my phone back to get in touckwith others. Will you be kind enough to give it back to me?Sncerely hope you can accept my apology and understaad my situationour studeLi hua

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