2022 英语周报 九年级 外研 40答案

短文改错:I have been thinking recently for what career I would like to have. My teacher often said that weaboutsaysshould choose a career what will help us do what we love. I have always been interesting in fashion, and Ithat/whichinterestedthink that fashion design will allow me A combine a career with my love of art.I have been ddesigned and made the costumes for three school playshiemany classmates and teachersthought was very nice and original. The most difficult part was producingit in the limited time. ThuswerethehemHoweverI really enjoyed the experience, and I thought that I did\the good job as well.71.for- about/fox【解析】考查介词。“地hi是常见短语,意为“思索,思考”,或删除“or”,当“hink意为“琢磨”时,后面可接宾语从句72.said-says【解析】考查时态。单陈述现阶段的事情,所以这个句子用一般现在时。73.what-that/wdi解析】考查定语从句。这个定语从句的先行词是“ career”,它在定语从句中作主语,所以用that或c钟导。74 interestingtinterested【解析】考查形容词。句子的主语是表示人的r,所以要用" Intereste”,表示“感兴趣的”。75.在 combine前面加to【解析】考查非谓语动词。“ allow sb to do sth”是常见用法,意为“让某人做某事”。76.删除 designed前面的ben【解析】考查语态。句意为“我为三场学校的话剧设计过服装”,可知此处构成了主动关系,所以用现在完成时的主动语态7.was-were【解析】考查主谓一致。该句的“ many classmates and teachers thought'是插入语,真正的主语是“ the costumes”,所以谓语用复数。78.it-them【解析】考查代词。此处代词指代的是前面的“ the costumes”79.Thus- However【解析】考查副词。前一句句意是“设计这些服装最大的困难是要在很短的时间内生产出来”,而本句是“我很享受这个经历”。可知前后句有转折语气,所以用“However80.the-a【解析】考查冠词。此处的“ a good job”指作者认为自己成功设计了三场话剧的演出服是很棒的工作。

20.【解析】(1)/(x)=a(sinx+ .rcos.),当a<0,x∈(0,)时,sinx>0,cosx>0.∴∫(x)<0,∫(x)单调递减;当a>0,x∈(0,)时,sinx>0,cosx>0∴∫(x)>0,∫(x)单调递增,综上得:当<0时,(x)在0.单调递减:>0时,f(x)在0.」单调递增(5分(2)由(1)知0>0时f(x)的最大值为/(2)=2a-2a由得a=2f(x)=2 .xsin.t'-1,又∵∫(x)在0,兀上单调递增且f(0)=-1<0./(2)=x-1>0∴f(x)在0,内有且仅有1个零点令(x)=f(x)=2(nx+ .cos.r),k(x)=2(2cosx- xsinx)<0,∴g(x)在(,x)内单调递减,且k()=2>0,g(x)=-2x<0…∴存在x0∈(,)使得x(x)=0①当x∈(,x)时,(x)>0,/(x)在(,x)单调递增x∈2,]时,(x)≥/()=x-1>0f(x)在(,)上无零点,②当x∈(xo,π)时,∫(x)<0,f(x)在(x0,π)内单调递减,又∴(x0)>0,f(x)=-1<0,∴f(x)在(.x0,丌)内有且仅有1个零点,综上所求:函数f(x)在(0,r)内有2个零点(12分)

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