2023届湘潭第四次模拟考试生物参考答案

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2023届湘潭第四次模拟考试生物参考答案试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有

16.(1)哀吾生之须臾羡长江之无穷(2)万里悲秋常作客百年多病独登台(3)出淤泥而不染濯清莲而不妖(每句1分,共6分,错字,丢字,落字都不得分)

12.A【解析】由题意,得当0≤x<2时,f(x)=2x-x2=-(x-1)2+1,极大值点为x=1,极大值为1,又当x≥2时,f(x)=3f(x-2),则极大值点形成首项为1,公差为2的等差数列,极大值形成首项为1,公比为3的等比数列,故an=2n-1,bn=3-,故设S=a1b1+a2b2+…+=1×1+3×31+5×32+…+39×31,则3S=1312+3×32+…+39×320,所以一25=1+2(31+32+…+3)-39×3=1+2X3(139×3202-38×3,则S=19×320+1.故选A

14解:(1)由2√3cosB(B为参数ly=2sinB得cosP23(为参数),sinB-y消去B,得1+所以曲线C的普通方程为2+x=1(4分)(2)曲线C截直线l所得线段的中点极坐标为(2x),化成直角坐标为(,1)设直线l与曲线C相交于A(x1,y1),B(x2.y2),两点,则√312+4=1且(8分)124由上式得12所以y2-y13(y2+y)3X2~33即kta又因为a∈[0,x),所以直线l的倾斜角为丌(10分)

22.(1)解;由题意,得+(2n+1)当n≥2时,an(2n-3)2(2n-5)2又因为a:=(2×1-1)2=1所以an=(2n-1)2分因为csn-1=an=(2n-1)2,所以cn=n2(n为奇数)又因为can-1,(2nc2-成等比数列,所以cn=c2x-1·c2n-1=(2n-1)2·(2n+1)2,所以c2n=(2n-1)·(2n+1),所以cn=(n-1)·(n+1)=n2-1(n是偶数),n=2k一1综上,cn=k∈N)(5分)2k(2)证明:先证一+73=3<4,显然成立(6分)当n≥3时,n≥n2-1,一≤所以-++≤1+1×32×451(8分)111再证≤++-+C①当n=2时,右边=1+,左边=,不等式成立;当n≥3时,不论n为奇数、偶数,都有一≥一2n(n+1)nn+11++一+-+…33×44×5n×(n1+….+1-13n+1综上所述,当≥2时,不等式3-n+1≤+1成立(12分)

33.(8分(1)相对性状自花传粉闭花受粉2)F1的自交F1的测交〈3》花蕾期去雄人工传粉

【语篇类型】记叙文【主题语境】人与自我—一团队合作【文章大意】小男孩Jos一家靠捕鱼为生。因为喜欢足球,小男孩无心帮助捎鱼,爷爷的一番话让他明白一家人捕鱼和足球运动样,只有团结合作才能成功。【写作指导] anagraph1的段首句是"当Jos进来时,爷爷拾头看着他,然后示意他过来",再结合续写笫二段的段首句可知,续写第投主要围绕爷爷把№s叫过去后和他谶话的内容以及Js对这些活的反应为主裉 Paragraph2的段首句中的" a family is like soccer"以及"worktogether"可知,Jos意识到无论是踢足球还是一个家庭都霄要团结协作的精神,故本段应围绕他思想和行动的转变展开。One possible versionParagraphGrandpa looked up at Jose when he entered, and then signalled to hito come over. As Jose approached him, Grandpa smiled, and then hisfingers went back to work. "In some ways, Jose, a family is like a fishingnet,Grandpa said as he wove strings of rope together to repair the brokelinks. "The strength of the whole depends on the strength of each linkJose knew he had let them down when he had run off after the net broketoday. It reminded Jose of what the coach had been saying aboutParagraph 2Grandpa, I guess a family is like soccer, too. Eneryone needs to worktogether to succeed, "Jase said. "I'm sorry about today. " Grandpa pattehim on the hack affectionately. then Jose ran to help grandpa fold thefishing net. The next day, Jose got up earlier than usual and fed Felix andPedro. On the beach, Jose grabbed the net and look his step steadily,moving al the pace of others. "How is your soccer practice going? " hissister came, asking. "So-so. But I would behave better today, "Josereplied, with a knowing smile. He was sure of it.