英语周报初一2022_2022笫27期答案

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

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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