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【语篇导读】本文是一篇说明文。文章主要介绍了无现金社会已经成为一种趋势,以及所存在的问题。l6.D根据前文There is no escaping our evolution into a cashless society,和后文As it is,people increasinglydemand low-touch or contactless payments with growing concerns over the spread of viruses and diseases.知,无现金是一种社会趋势,新冠肺炎疫情加速了这种趋势。17.AA cashless society would give rise to a new era...The idea of a cashless society appears verycommon in our society.及下文存在的问题可知,虽然无现金社会有很多的好处,但离全社会普及的现实还很远。l8.C根据前文Economic inequality and inclusivity are fundamental issues still present worldwide.和后文Theunbanked and poor could face significant challenges with digital modes of payment.可知,这里陈述无现金社会可能会让原来存在的问题恶化。l9.F根据前文For a cashless society.,the financial inclusion issues currently in existence.和后文There are alsothe elderly..technological advancement..可知,这里陈述建立无现金社会需要考虑到无银行账户的人、老年人和残障人士。所以F项符合语境。20.E根据后文It is also about to launch a national digital currency.,one that does not leave anyone behind.可知,这里陈述中国无现金社会的普及情况。
【答案】BCD【解析】由题意可知,圆T:x2十y2=3,对于选项A,椭圆C的一个外切矩形可设为ABCD,则其面积S=4X2×OA|X IOBIsin∠AOB=6sin∠AOB,所以矩形ABCD的面积最大值为6≠4E,故选项A错误;对于选项B,当PM与圆相切且切点P在x轴下方时∠PMN最大,IOM|=2√3,|OP|=√3,|MP|=√I2一3=3,则tan∠PM0=,且∠NMO=45,所以an∠PMN=an(∠PMO 46)==2十√3,故选项B正1、③×1确;对于选项C,当PQ的斜率存在时,可设直线PQ的方程为y=kx十m,P(x1,y1),Q(x2,y2),由y=kx十m,2kmm2-3x2 y2=3,联立消去y可得,k2 1)x 2mx m-3=0,则x十x:=2 112一0 i,则1y:=十m):十m)=",当直线PQ与精国相初时,y=kx十m,2 y2=1,联立消去y可得,(2k2十1)x2 4mx 2m-2=0,4=16k2m2-4(2: 1)(2m2-2)=0,化简得2k2 1=m2,所以km·k0=m23张m2-311,当PQ的斜率不存在时,则P(2,1D,Q(-2,1)或Q(W2,1),P(-2,1),此时kom·ko四=-2,故选项C正确:对于选项D,知图,因为PF,·PF=号,PF, PF,=2a=2反,所以PF, 1PF, PF PF:=2 PO,2PF,·PF2|=8,所以|PF:12 |PF2|2=5,由得PF PF 2PF·PF=PF-PF:=F2F:.4P02①,PF2 PF2-2PF1·PF2=F2F2②,则① @,可得10=4P心 4,解得P0:=号,所以1PM1·PN1=(r PO1)(r-P01)=r2-PO2=3-三=,故选项D正确.1y4M