山西省2023届九年级阶段评估(一)[1LR]数学试题 答案

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【答案】8√23【解析】设△ABC的外接圆的圆心为D,半径为r,球的半径为R,球心为O,底面△ABC为直角三角形，故其外接国圆心D在斜边中点处，则r=1.又OD=AA,=1,在Ri△0CD中，R=+T=2,所以V=3πR=823元

【语篇导读】本文是一篇说明文。文章列举了人工智能给人们带来的挑战和隐患。16.G As artificial intelligence (AI)continues to change our world,it will have good and bad influenceson our society.和下文But some changes could be challenging.可知，G项承上启下，符合语境。l7.B根据下文Some people are concerned about the loss of jobs caused by the use of machines.可知，人工智能导致失业。B项中提及的“就业市场变化”符合语境。18.C According to PwC,a global company,millions of present jobs will be replaced by AI in the UKfor decades to come.When people face new jobs,making a living can be challenging for some of them.知，C项符合语境。l9.A根据上文Another challenge is about the safety of our data,like our age,our address and our interests..可知，本段话题与data有关，A项符合语境。20.F One more challenge is whether machines will become super-intelligent and be out of humanscontrol at last..If that happens,it may risk our society's safety,instead of doing good to it.可知，F项符合语境。