2022-2022 英语周报 七年级 外研 第27期答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

31.答案:2解析:如图所示,因为F1A=AB,所以A为F1B的中点.又O为F1F2的中点所以AO∥aBF2,AO=aBF2因为F1B·F2B=0,所以∠F1BF2且O为F1F2的中点,所以OB90°,FIF2=OF2=c由AO∥BF2得∠OBF2=∠AOF1=∠BF2F1,所以OB=BF2,因此△OBF2为等边三角形,∠BOF2=60°,即渐近线的斜率为3,也即一=3,所以e

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