2022年九年级仁爱版英语周报答案

21.解(1)由椭园的定义知|PF1|+|PF:|=2a=4a=2∵PF1⊥F1F1;·|PF1|=一b=1.椭围r的标准方程为x+y2=1(2)设B(x,y),则C(-2,-y),且+=1,则buB·k×=一为2=分别设直线AB,AC为x=my+2,x=my+2,则m1·m=ku·kc=-4r-miy+2→(m+4)y2+4my=0→1+y=1+4=my+2→(m+1)y2+4my=0=yw=-LHy+y2=4+1同理可得=一m4m+4“=m+1ABIAM=2m+1 AC二测+16m!+4AN(m+4ABI JACI 5aiAM+IANI-4(m+4)-

【答案与解析本文是一篇记叙文。作者主要介绍了自己的旅行。24.D细节理解题。根据第一段“ My goal was to visit100 countries by the time I was30. For whateverreasons, I thought that'sounded cool. I ended up achieving that goal at about25.”可知,作者在25岁左右的时候已经实现了游览100个国家的目标。25.B推理判断题。根据第二段“n2006, I got an email from a friend where I learned that there was actually arecord of the youngest to visit every country in the world.. "K"Five years later, it turned out to be a greatdecision, and I became the youngest American to visit every country when I was32then.”可推断,作者在2011年创造了一项新的世界纪录—成为世界上游览了所有国家的最年轻的美国人。算“,)26.C推理判断题。根据最后一段“ But in the summer of2008, I simply resigned my position at a major WallStreet firm. It happened right before the collapse(ELf) of several major firms, so it made me look smartbut it was pure coincidence.”可知,作者恰巧在大公司瓦解前辞职了。由此可推断,作者的辞职对他来说是件幸事27.D主旨大意题。通读全文可知,作者主要是介绍了他的旅行。

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