2020~2022八年级上册英语周报第八期答案

11.ABD【解析】因为f(x)=x+sinx,所以f(x)=1+cosx≥0,所以f(x)在R上单调递增,又因为f(-x)=-f(x),所以函数f(x)为奇函数,所以f(2)>f(-1)成立,所以A正确;又因为f(-1)<0,f(1)>0,所以B正确;又因为g(x)=r为偶函数,所以f(2)f(-2)所以C错误;又因为g(x)=xf(x)为偶函数,且当x>0时,g(x)单调递增,所以-2021f(-2021)=2021f(2021)>2020f(2020),所以D正确故选ABD

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!

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