英语周报八下34期2022答案

17.解:(1)∵csin(B C-A)=asin(A B)由正弦定理得 sin Csin(B C-A)= sin asin(A B),Bp sin Csin(T-2A)= sin Asin C.∵C∈(0,丌),∴sinC>0,则sin(m-2A)=sinA,即sin2A=sinA(3分)∴2 sin Acos A=sinA,∵A∈(0,丌),∴sinA>0,则cosA=,(6分(2)'.sin B- 2sin C,,b-20由余弦定理可得coA= c,即2(9分)整理得3c2=a2,又524sA=3,=2,所以2=4,c=2,则a=2、3,b=4,∴△ABC的周长为2 4 23=6 23.(12分)

B【语篇导读】本文是一篇记叙文。作者小时候遇到了Mrs.Rese,从她那里学到了许多东西和对世界新的认识。24.A【解析】推理判断题。根据第二段 It was nothinglike the one I lived in with my mother. a small darkdace with rules about befriending others.可知作者的生活环境不好,家庭经济条件也不富裕。故选A25.C【解析】推理判断题。根据第四段 I could nottake my eves off her bracelets(手镯) and shiningrings. HI"We could begin right now if you like, "shesaid with a smile. I felt beautiful. That day I learnedthat the house of my dreams was her house.可知作者被老师的打扮、声音、微笑和住处吸引,故选C26.C【解析】推理判断题。根据倒数第三段 At somepoint, I managed to wear my mother down and one Saturday aftermoon, I rode out to Mrs. Reese's house n]知作者是想方设法得到母亲许可后去Mrs. Reese家的,故选C。27.B【解析】推理判断题。根据文中 I learned how toanswer questions about my age and my favorite food inSpanish. fH We had tea. She painted my toenails red.We made a garlicky picadillo. We spoke in Spanish. InSpanish, my voice was loud and romantic. This is thereal me! I remember thinking.作者在Mrs.Rese那里学到了许多东西, But four decades later,Isilremember that day and the life she showed me, proof ofa possible future.是 Mrs. Reese让他获得了对世界新的认识。故选B

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