第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

21.解:(1)A班3次摸球共有33=27种不同的可能,其中集齐红球,黄球,白球有A=6种,故P(A3)6271分A班4次摸球共有3*=81种不同的可能,n次后集齐红球,黄球,白球,即某种颜色出现两次,其余各出现次,可能性为C(=3种故P(A一3-=……………………………………………………2分B班摸球3次共有2=8种不同的可能,其中不能集齐黑球,蓝球有2种,故P(B3)=8=…3分B班摸球4次共有24=16种不同的可能,其中不能集齐黑球,蓝球有2种,即全是黑球或全是蓝球,故P(B1)=14分168(2)记a=P(A),b=P(B,),根据(1)的计算,不难整理得下表235a=P(A.4497850816分b,=P(B)152由于B的对立事件总是2种情形,即全是黑球或全是蓝球,故b=1-=1-()”1…7分a1=a·a2+b2·b2m9a×0+÷b2令即8分a4=a·a3+b·b3423+一b313解得{,2或2(含去,因为a≠3a,+(-3)b),444444444449分故an=an-1+()b-1,即an-an-t(÷)-2(÷)3--4-(3)-2(}a2-a1=-2X10分累加可得P(A,)=a,=1+(1)1-2(2)”(n≥2)11分当n=1时,a1=0适合上式,:P(A,)=a=1+(1)=2(2)”(n∈N)12分

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