英语周报2021-2022第六期答案

18.解:(1)连接AC,因为底面ABCD为正方形,所以AC⊥BD.又因为PA⊥平面ABCD,所以PA⊥BD又AC∩PA=A,所以BD⊥平面PAC因为AEC平面PAC,所以BD⊥AE(4分)PD(2)因为PA⊥平面ABCD,所以PA⊥CD,又因为底面ABCD是边长为2的正方形,所以CD⊥AD,又PA∩AD=A,所以CD⊥平面PAD.过点E作EH∥CD,则EH⊥平面PAD,(7分)又因为PE=2EC,所以EH=4,(8分)所以Vp=AED=VE-PD≈34△ PAD X EH=XADX PA×EH=×士×2×4X(12分)

24.B【解析】细节理解题。根据第一段中的“Butrather than enjoying myself, I felt like I had hit bottom.”可知,作者起初并不开心,而是心情糟糕透了。25.D【解析】推理判断题。根据第二段中的“ It wouldmean I wouldn't be able to do much including workfor a few days.”可推断出,作者之所以对摔断腿感觉不错是想逃避现实。26.C【解析】细节理解题。根据倒数第二段中的emingly out of the blue, i got an email that said Iad the green light to move back to my old group. Justlike tha.”可知,作者最终回到了当初的工作岗位上。27.A【解析】推理判断题。根据全文的内容,尤其是But rather than enjoying myself, i felt like I had hitbottom", "Broken legs sounded pretty good to me rightthen”和“ After i decided that, the elephant on mychest was getting lighter.”"以及“ I didn’ t have to doanything but hug my good fortune and feel grateful thatnings.. my mind is tree of the stress and anxietythibeen dealing with for the last few months”可知,作者写此文的目的主要是表达个人的情感。

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