英语周报2021-2022高三新课程第15期答案

Dear Mike,Hows it going recently! Ive heard that you'l studywith me for some time in the future as an exchange studentIt'l be my pleasure to tell you something aboutour teachersTo be frankIn our school, my tavonte teacher Is ourChinese teacher, Ms. Liu. She is in her thirties and looksEmuch younger for her age. She is tall and slim with longhair reaching her waist. She is not only strict with us, butaho kind and optimistic about life, which makes her sopopular among us. She always encourages us to overcomethe difficulties in our life More importantly, her way ofteaching that makes Chinese so easy and interesting for usto learn, is nothing like that of the other teachers'. It isconfirmed that under the guidance of such a talentedteacher, we will achieve what we want and be more confident in our future lifeI'm looking forward to your arrival and welcome to ourchoBest wishes and stay healthy.Yours,Ua

4.B【解析】因为b=2cosB+2 bcos c,由正弦定理得sin B= 2sin Ccos B+ 2sin Bcos C=2sin(B+ C)2sinA,从而b=2a,所以=2故选B

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