2021-2022 英语周报 高二 外研综合 22答案

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

18.【解析】(1)作AM⊥PB于M则由平面PAB⊥平面PBD→AM⊥平面PBD→AM⊥BD取AD中点为Q,则BC∠QD→BQ=CD=1=QD=QA→∠ABD=90°又∠PBA为锐角,∴点M与点B不重合DB⊥AB→DB⊥平面PAB→DB⊥PADB⊥AM又PA⊥AD,DB与AD为平面ABCD内两条相交直线,故PA⊥平面ABCD.……5分(Ⅱ)由(I)知:AM⊥平面PBD故∠ADM即为AD与平面PBD所成角,在R△PAB中,AM=2→∠PBA=45故PA=1,S△PAB=,S△PAD=1,AB·BD3而∠PBD=90°→S==2PB·BD_2×③2故所求表面积为+1+2+3+万+12分

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