2022英语周报九年级第七期外研版答案

书面表达Dear Sir or MadamI am Li Hus, an exchenge student from China. Wanting to get a library card in your library.(背景2分)1 am writing to ask for some relvant information.(目的3分)to begin with, could you please tell me what kind of books can beborrowed?(要点一6分) besides, I would be very interested to ksomething about borrowing system, including how long I can keep thebooks, how many books I can borrow once, and how much I should pay(要点二6分)L8 t but not least, I also wonder when and where I canmake it.(要点三6分)a中aThanks for your ime and I would appreciate it if you can give an earlreply.(表感谢+期回复2分)1量里的0+Yoour sincere.yLi H点国惊口人国文

【答案】C【详解】BB由sin(A+C)=2√3sin2可得sinB=2√3sin所以2 sin-cos3=2√3sin3BBBB因为B∈(0,x),所以,0.n,sin73≠0,所以cos2=√B丌所以=-,B所以b2=a2+c2-2 ac cos B=4+9-12×=7,即b=√7,所以cosA=b+c2-a27+9-42bc677,所以smA=所以si24=2sinA0A=2x2V52=45故选:C.

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