2022 英语周报 高三 外研综合（OT） 52答案

书面达I'm delighted to know that you are going to ukpart in. Chinese poetry recitation contest. The factthat you are so interested in Chinese culture makes mhappy Now I'd like to offer you some practical adviceFirstly, you should have a better understanding ofwhat you are going to read. Only by doing this can youappreciate its beauty. Secondly, correct your pronuneation by listening to Chinese radio programs because allannouncers speak standard Chinese. What'sgood idea to make some Chinese friends and cote with then as often as possible, which can improve your spoken ChiI hope my opare of help to you and wishyou good luck andYours.Li H

4,B【解析】本题考查平面向量的数量积,考查运算求解能力因为(a-b)⊥(3a+2b),|b|=2a|,所以(a-b)·(3a+2b)=3a2-a·b-2b=-a·b-a2=0,所以a·b=-a2设a与b的夹角为,则cosa·b=2aba|·2因为0∈[0°,180°],所以0=135

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