2022 英语周报 九年级 课标 52答案

C本文是一篇说明文。研究者们发明了二种app,目的是解决道路的安全问题28.B推理判断题。根据第一段第一句“Adgmap which shows you the safest way to ghome, rather than just the quickestbeen developed by Cardiff Universityprevent the rise in pedestrian deaths.知,理想的电子地图应该为人们提供最安全到达目的地的路线。故选B。29.C细节理解题。根据第三段最后一句“Thaim of the study was to invent a fancy waof dealing with the rising number of pedestrian casualties that are occurring on ouoads each year."”可知,研究者发明这种新app的目的是通过用一种新方法来解决道路安全问题。故选C。0.B推理判断题。根据第四段第四句“ Of thos15 cities. Liverpool was ranked as havingthe most unsafe roads whereas Bath wasseen to have the safest.”可推知,利物浦的行人死亡数量是最多的。故选B。31.C观点态度题。根据最后一段最后一句“Thresearchers believe the maps could also buseful to city planners and developers wheassessing how changes to infrastructurmay affect road safety, such as the pedtrianizing of roads or the changing of可知,作者认为新研发的app在保道路安全方面很有效。故选C

【解析】取AC中点为O,连接OB、OP,B因为AB⊥BC,O为AC中点,所以OA=OB=O0又PA=PC,所以PO⊥AC,平面PAC⊥平面ABC,所以PO⊥平面ABC,故球心在PO上,设球心为O,半径为R,则OA=OP=OC=R,所以球心O为△PAC的外心,因为AC=√AB BC=2√2,cos∠APC=AP2 CP2-AC2AP·CP2×3×39h∠APC=√-(÷)=2.mn2rc=2R解得R=9,故球的表面积S=4元R

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