2022届江西省西路片七校第二次联考英语答案

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第二节书面表达One possible version:Dear classmates,While watching the historic moment when the threeChinese astronauts were sent up into space,I felt so excitedthat I couldn't hold back my tears.This great achievementhas showed not only our advanced technology but also thegreat power of China.At the same time,it made me realizeour responsibility.And I have made up my mind to have agood command of knowledge.Only in this way can we makegreat contributions to our country Dear classmates,let'sstudy harder for a more powerful China!Thanks for your listening.

13.2√5依题意，a-b|=√20，又|a=√7，b=√/13，∴.a2 b2=a-b|2,.a⊥b,∴.|a b=√/a2 bz=2√5.