论文部分内容阅读
语文
出题人:唐金龙,特级教师,执教于安徽省巢湖市柘皋中学。
【选文】
画轴应该怎样打开
2008年奥运会开幕式上,我们向全世界人民缓缓地打开了一个画轴,展现了中国的水墨山水:我们让外国人感受黑白两色的神奇,让外国人看到中国古代绘画意境中的抽象能力,让外国人知道中国自古就不土。
这张水墨画应该是迄今为止全世界最大的一张水墨画,在上面表演的演员们小如芥豆,其比例在传统的中国画中乃为最佳,让观者称奇。我知道,当这幅画缓缓打开之时,画面山河壮丽,气象万千,美得让许多人热血澎湃。
很可惜打开画轴的方式错了。这幅巨画由中间向两边打开,展示千里江山。而中国画的传统是,无论画轴长短, , 。 ,是外国人看地图的方式。
以著名的《清明上河图》为例,画家由都城的郊区画起,静谧安详,人烟稀少;逐渐炊烟袅袅,三两人群;直至车水马龙,市井喧嚣。这是一个艺术表达的过程,由右向左,符合中国人渐进的审美。中国人从不喜欢一针见血的表达方式,国人含蓄,不仅注重内在,更注重表达。
遗憾的是开幕式上这幅大画轴的表达方式西方化了,将中国人所创造的神秘破坏掉了,一览无余地由中间直接打开,寡然无味。幸亏是画卷,如果是文字表达,可让人怎么去读呢?这个貌似不重要的错误实际上很重要。方式决定着表达,中国人自古喜欢缓缓叙述,逐渐达到高潮。如果上来就是高潮,观者太难进入其中了。一幅由中间向两边打开的中国画,会让仔细观画者看成散(读san四声)眼(与对眼相反),左右都难顾及,那后面就不可能再有高潮了。
(选自《知识窗》2010年第7期)
【问题】
文中画线处,分别是中国画轴打开的方法与外国人看地图的方法,请补齐画线处的文字。
数 学
出题人:洪其强,特级教师,执教于贵州省龙里中学。
已知A、B、C是直线l上的三点,向量OA,OB,OC满足:OA-[y+2f′(1)]OB+ln(x+1)OC=0。
(1)求函数y=f(x)的表达式;
(2)若x>0,证明:f(x)>2xx+2;
(3)若不等式12x2≤f(x2)+m2-2bm-3时,x∈[-1,1]及b∈[-1,1]都恒成立,求实数m的取值范围。
英 语
出题人:程中一,特级教师,执教于北京市大兴区第一中学。
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
1—Where are sold?
—In the nest store.
Amen and childs shoes
Bmens and childrens shoes
Cmen and children shoes
Dmens and childs
2 is a possibility that we shall not be able to afford the particular we need.
AIt; furniture
BThere; furnitures
CThere; furniture
DIt; furnitures
3Lesson 2 is most difficult lesson in Book 11, but it is not most difficult lesson in it.
Aa; the Bthe; a
Cthe; theD/; the
4—The education system rather than the teachers to answer for the overburden on the students.
—I agree. I hope the reform being carried out in our country at present will bring about the results.
Aare;desiredBis;desired
Care;desiringDis;desiring
5Tom is one of the boys who here on time. He is the only one of the boys who here on time.
Ahas come; have come
Bhave come; has come
Chas come; has come
Dhave come; have come
6Was in the battle on June 4, was led by captain Johnson, Tom lost his life?
Ait; when; that
Bthat; that; who
Cit; which; that
Dit; which; when
7Seeing hat, he couldnt help thinking of hard time in the countryside.
Athe old round yellow small
Bthe small round old brown
Ca round brown small old
Dthe round old small round
8—Can Li Ping help me with my English?
—I regret to tell you her English is yours.
Aas good asBno more than
Cno better thanDas much as
9I to take a holiday this summer, but I had to change my plans.
Awould hopeBwas hoping
Chad hopedDhad been hoped
10—I sent him the book by airmail this morning.
—You that; he is coming tomorrow afternoon.
Aneednt have done
Bmustnt have done
Ccouldnt have done
Ddidnt have to do
11Is this the secretary you want the article?
Ato have typeBher to type
Cto have typedDher type
12We must do whatever we can those who are in trouble.
Ato helpBhelp
ChelpingDto have helped
13The student lay on the grassland with his hands behind his head and eyes .
Acrossed;shutting
Bcrossing;shutting
Ccrossing;shut
Dcrossed;shut
14Just now I saw a man in the street, with a little boy on his shoulder.
Awalking;seating
Cwalk;sat
Cwalking;seated
Dto walk;sitting
15The young man rushed out the room, into his car and started it hurriedly, to get home as soon as possible.
Agot;hopedBgetting;and hoped
Cgot;hopingDgetting;hoped
16 would like to devote his whole life to his country should go there are kinds of difficulties.
AWho;somewhere
BWhoever;where
CWhatever;anywhere
DWho;where
17Last term Mr.Cheng set so difficult an exam problem none of us worked it out.
AthatBas
Cso thatDwhich
18 we get good weather it will be a successful holiday.
AEven ifBProvided
CAlthoughDUnless
19I dont think he could have done such a stupid thing last night, ?
Ado IBcould he
Cdid heDhas he
20When I try to understand it is that prevents so many Americans from being as happy as one might expect, it seems to me there are quite a few causes.
Awhy;thatBwhich;as
Cwhat;thatDwhether;since
21 rich certain natural resources may be, they can not replace themselves and are surely to be used up sooner or later.
AHoweverBWhatever
CHowDWhichever
22When Mr. Green opened the front door of the shop on a cold winter morning, he found first customer was other than his old school friend.
AnobodyBnone
CanyoneDno one
23During the Spring Festival, the railway put on trains to make people go home conveniently for the family reunion.
AunusualBregular
CparticularDspecial
24The young man decided to accept the job, so he was asked to his acceptance in writing.
AconfirmBconvey
CconvinceDconsider
25 it is true that a students most important goal is to study well, it doesnt need to be the only goal.
AWhenBWhile
CAsDBefore
26Is this museum you visited a few days age?
AwhereBthat
Con whichDthe one
27Mother bought me a dictionary on my birthday, made me very happy.
AwhatBthat
CwhoDwhich
28Have you ever had a case someone accused your journalists of getting the wrong end of the stick?
AwhichBthat
CwhereDwhen
29She still remembered several occasions in the past she had a similar feeling.
AwhyBwhich
CwhereDwhen
30—What do you think of Mrs.Green?
—She is as you could ever meet.
Aan as kind lady
Bas a kind lady
Ckind as a lady
Das kind a lady
上期答案
语 文
【解析】
答题前,可搁置题干,先把诗歌读懂。紧抓“感情”这一主线,只要大体抓住了作者所抒发的感情,就可以说基本上读懂作品了。先给自己提出第一个问题:这首诗的感情基调是偏重于喜还是偏重于忧(或褒还是贬)。这一提问的实质是要回答“是什么”。带着这一问题粗读该诗,即有诸如“水净”“明眼”“可当山”“无限意”“有余闲”“目随”“坐待”等叙述、描绘性词语从眼前掠过,使我们能够透过这些带有点睛性质的词句,隐隐体会到诗人的愉悦、自得之情,初步得出“这首诗的感情基调偏重于喜”的结论。
提出两个相关问题:第二,为什么喜(褒)或忧(贬);第三,用什么方式表达这种感情的,最主要的表达技巧是什么。这一环节,从逻辑上说,是第一个问题的深入与继续,回答“为什么”和“怎么做”。具体操作上,先要解决第二个问题,回答“为什么”,即要找出“这首诗的感情基调偏重于喜”的根据所在。我们看到,诗人在首句即紧扣题目“后湖”,先写因水之明净而觉眼前一片明澈,次写所居之城因荒僻而“可当山”,这无疑是带有喜悦的感受、感觉。颔联写青林、白鸟,则含蓄地表达了诗人自己的悠闲情怀。颈联中值得注意的是“江湖”一词,暗示了诗人此时正过着隐居生活,无所羁绊,言外不无欣然自得之意。尾联是人、景同写:诗人纵目追随着暮归的大雁,直至在视野中完全消失。雁已归尽,诗人仍旧流连忘返,饶有兴致地坐等着暮鸦归来,散漫闲适之情,溢于言表。
聪明的考生不会放过诗后那条用以提示写作背景的简洁注释,他们会抓住其中“罢归”“赋闲”这些关键字眼,从中看到陶渊明——一个在中学教科书中与之神交已久的辞官归隐田园的形象——的身影,其对准确答题会有很大帮助帮助。
接下来解决第三个问题,这一问题的主旨在于探讨写作手法和表达技巧。目光应聚焦于诗歌的第二联,因为这两句对景物的描写带有明显的拟人化色彩:苍茫的暮色之下,远处蓊蓊郁郁的青林如同怀着无限情意;又见白鸟从容、悠然地归巢于林间,仿佛极有余闲。这里,诗人将树木、白鸟人格化,在某种意义上正是为了自比,以传达诗人自己此时仿佛物我两忘的超然心境。
经过上面步骤的实际操作,依次解决“是什么”“为什么”“怎么做”三个关键问题之后,回答例题中的两个问题就是水到渠成之事了。
【答案】
(1)拟人手法。写青林怀着无限情意;又写白鸟从容、悠然,仿佛极有余闲似的。这里将“青林”“白鸟”人格化,含蓄地表现了诗人悠闲的心境。
(2)抒发了罢归后不再为繁重的公务以及官场的尔虞我诈而劳心费神的自得之情。(此题可以进一步结合试题后的注释做出)
数 学
解:(1)由n∈N*知f(n)=n(n+1-n)+f(n-1)=n+f(n-1),即f(n)-f(n-1)=n,显然
f(1)-f(0)=1
f(2)-f(1)=2
f(3)-f(2)=3
……
f(n)-f(n-1)=n
迭加得:f(n)-f(0)=1+2+3+…+n=n(n+1)2。因f(0)=0,则f(n)=n(n+1)2,即an=n(n+1)2(n∈N*)。
(2)因为x轴、直线x=a与函数y=f(x)的图像所围成的封闭图形的面积为S(a)(a≥0),且f(n)=n(n+1)2。显然,当n=1时,S(1)表以f(1)为底,高为1的直角三角形的面积;当n=2时,S(2)表在S(1)的图形外再增添一个以f(1)为上底,f(2)为下底,高为1的直角梯形的面积;当n=3时,S(3)表在S(2)的图形外再增添一个以f(2)为上底,f(3)为下底,高为1的直角梯形的面积,……同理可得S(n)的图形。
无疑,当n=1时,S(1)-S(0)表-直角三角形的面积,当n≥2(n∈N*)时,S(n)-S(n-1)表上底为f(n-1)、下底为f(n)、高为1的直角梯形的面积。故此
S(n)-S(n-1)=f(n-1)+f(n)2×1=an-1+an2=12n(n-1)2+n(n+1)2=n22。
(3)设存在正整数t,对一切n>t恒成立,因n(n+1)2-1005>n22n2>1005,即n>2010,又T={2000,2002,…,2008,2010,2012,…,2998},则正整数t可取值2010,2012,……,2998。这是首项为2010,公差为2的等差数列。设其项数为n,由
2010+2(n-1)=2998,得n=495。T中共有495个满足条件的正整数t,tmin=2010。
(4)可构造数列bn=1an,因an=n(n+1)2(n∈N*),则bn=2n(n+1)=21n-1n+1,
因b1+b2+…+bn=21-12+12-13+13-14+…+1n-1n+1=21-1n+1,
显然极限存在,且limn→SymboleB@ (b1+b2+…+bn)=limn→SymboleB@ 21-1n+1=2。
综上,构造数列bn=can(c≠0,c为常数),bn=122ann+1,bn=q2ann+1(0<|q|<1)等都能使limn→SymboleB@ (b1+b2+…+bn)存在。
英 语
Keys:1 — 5 CDBCD 6 — 10 BCABC 11 — 15 BCACA 16 — 20 CDBCB
解析:
1从前面的 too 和后面的 over-confident 及结合全文可知年轻人太狂傲。
2上下文线索告诉读者,年轻人自以为是什么事都能做,everything表示一切。
3 ignore 忽略,看不起 ,文章主要讲年轻人看不起老年人。
4文中的作者过去也是这样一个年轻人, was used to 和 got used to 表示习惯于;use to 属干扰项,没这个短语;而used to过去常常。
5作者要和读者分享这个故事,用share sth. with sb。
6文中的故事讲的是一个年轻人看不起老年人,looked down on 看不起;looked up at 仰视、尊敬;looked up 查阅;looked down 低头。
7 a useless life 是先行词,且不表示人,同时所填答案要作后面定语从句的主语。
8 suggested 表建议,后面的从句用虚拟语气,谓语应为 (should) + do 结构。
9 a beautiful garden came into their sight 中的 came into their sight 表示进入视野。
10 falling 指说话时正在掉落的叶子,现在分词表示在进行,而 growing 表示在生长。
11分词的一般式表示的动作和后面谓语动词的动作同时发生,即 hearing 和 smiled的动作同时发生,而 having heard 是完成式,表先发;hearing 的逻辑主语是后面的 the father,表主动,但C、D表被动。
12从后面的 nothing 可看得出是转折关系,应用转折连词 but,而 however 是副词。
13“in + n .”的结构等于副词,silence 是名词,in silence = silently;silent 是形容词;silently是副词;a silence是干扰项。
14 show sth. to sb. 句型结构,“拿……给某人看”。
15 such + a + adj. + n. = so + adj. + a + n.表示“如此……的一个……”。
16“not + every + 单数可数名词”是一个表示半否定的结构,表示“不是每个……都……”。
17 keep sth. in ones mind,固定句式,表示“牢记……在心”。
18 a lot 是 taught me 的程度状语;a lots 是干扰项;a lot of = lots of 后接名词。
19上下文说年长的人有生活社会经验,故选用 experienced,且第一段也有提示;ripe表示水果等熟透了;silly 意思不合文意;green“没经验” 或“(水果)生的”。
20 one 代表前面的单数名词,而 ones 代表前面的复数名词;things 泛指东西、事情;items 条目、款项、项目等;ones 代表前面的 walnuts 或指“人”的概念,而且前面有they are 这一提示。
责任编辑 刘 静 李婷婷 张丹凤
出题人:唐金龙,特级教师,执教于安徽省巢湖市柘皋中学。
【选文】
画轴应该怎样打开
2008年奥运会开幕式上,我们向全世界人民缓缓地打开了一个画轴,展现了中国的水墨山水:我们让外国人感受黑白两色的神奇,让外国人看到中国古代绘画意境中的抽象能力,让外国人知道中国自古就不土。
这张水墨画应该是迄今为止全世界最大的一张水墨画,在上面表演的演员们小如芥豆,其比例在传统的中国画中乃为最佳,让观者称奇。我知道,当这幅画缓缓打开之时,画面山河壮丽,气象万千,美得让许多人热血澎湃。
很可惜打开画轴的方式错了。这幅巨画由中间向两边打开,展示千里江山。而中国画的传统是,无论画轴长短, , 。 ,是外国人看地图的方式。
以著名的《清明上河图》为例,画家由都城的郊区画起,静谧安详,人烟稀少;逐渐炊烟袅袅,三两人群;直至车水马龙,市井喧嚣。这是一个艺术表达的过程,由右向左,符合中国人渐进的审美。中国人从不喜欢一针见血的表达方式,国人含蓄,不仅注重内在,更注重表达。
遗憾的是开幕式上这幅大画轴的表达方式西方化了,将中国人所创造的神秘破坏掉了,一览无余地由中间直接打开,寡然无味。幸亏是画卷,如果是文字表达,可让人怎么去读呢?这个貌似不重要的错误实际上很重要。方式决定着表达,中国人自古喜欢缓缓叙述,逐渐达到高潮。如果上来就是高潮,观者太难进入其中了。一幅由中间向两边打开的中国画,会让仔细观画者看成散(读san四声)眼(与对眼相反),左右都难顾及,那后面就不可能再有高潮了。
(选自《知识窗》2010年第7期)
【问题】
文中画线处,分别是中国画轴打开的方法与外国人看地图的方法,请补齐画线处的文字。
数 学
出题人:洪其强,特级教师,执教于贵州省龙里中学。
已知A、B、C是直线l上的三点,向量OA,OB,OC满足:OA-[y+2f′(1)]OB+ln(x+1)OC=0。
(1)求函数y=f(x)的表达式;
(2)若x>0,证明:f(x)>2xx+2;
(3)若不等式12x2≤f(x2)+m2-2bm-3时,x∈[-1,1]及b∈[-1,1]都恒成立,求实数m的取值范围。
英 语
出题人:程中一,特级教师,执教于北京市大兴区第一中学。
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
1—Where are sold?
—In the nest store.
Amen and childs shoes
Bmens and childrens shoes
Cmen and children shoes
Dmens and childs
2 is a possibility that we shall not be able to afford the particular we need.
AIt; furniture
BThere; furnitures
CThere; furniture
DIt; furnitures
3Lesson 2 is most difficult lesson in Book 11, but it is not most difficult lesson in it.
Aa; the Bthe; a
Cthe; theD/; the
4—The education system rather than the teachers to answer for the overburden on the students.
—I agree. I hope the reform being carried out in our country at present will bring about the results.
Aare;desiredBis;desired
Care;desiringDis;desiring
5Tom is one of the boys who here on time. He is the only one of the boys who here on time.
Ahas come; have come
Bhave come; has come
Chas come; has come
Dhave come; have come
6Was in the battle on June 4, was led by captain Johnson, Tom lost his life?
Ait; when; that
Bthat; that; who
Cit; which; that
Dit; which; when
7Seeing hat, he couldnt help thinking of hard time in the countryside.
Athe old round yellow small
Bthe small round old brown
Ca round brown small old
Dthe round old small round
8—Can Li Ping help me with my English?
—I regret to tell you her English is yours.
Aas good asBno more than
Cno better thanDas much as
9I to take a holiday this summer, but I had to change my plans.
Awould hopeBwas hoping
Chad hopedDhad been hoped
10—I sent him the book by airmail this morning.
—You that; he is coming tomorrow afternoon.
Aneednt have done
Bmustnt have done
Ccouldnt have done
Ddidnt have to do
11Is this the secretary you want the article?
Ato have typeBher to type
Cto have typedDher type
12We must do whatever we can those who are in trouble.
Ato helpBhelp
ChelpingDto have helped
13The student lay on the grassland with his hands behind his head and eyes .
Acrossed;shutting
Bcrossing;shutting
Ccrossing;shut
Dcrossed;shut
14Just now I saw a man in the street, with a little boy on his shoulder.
Awalking;seating
Cwalk;sat
Cwalking;seated
Dto walk;sitting
15The young man rushed out the room, into his car and started it hurriedly, to get home as soon as possible.
Agot;hopedBgetting;and hoped
Cgot;hopingDgetting;hoped
16 would like to devote his whole life to his country should go there are kinds of difficulties.
AWho;somewhere
BWhoever;where
CWhatever;anywhere
DWho;where
17Last term Mr.Cheng set so difficult an exam problem none of us worked it out.
AthatBas
Cso thatDwhich
18 we get good weather it will be a successful holiday.
AEven ifBProvided
CAlthoughDUnless
19I dont think he could have done such a stupid thing last night, ?
Ado IBcould he
Cdid heDhas he
20When I try to understand it is that prevents so many Americans from being as happy as one might expect, it seems to me there are quite a few causes.
Awhy;thatBwhich;as
Cwhat;thatDwhether;since
21 rich certain natural resources may be, they can not replace themselves and are surely to be used up sooner or later.
AHoweverBWhatever
CHowDWhichever
22When Mr. Green opened the front door of the shop on a cold winter morning, he found first customer was other than his old school friend.
AnobodyBnone
CanyoneDno one
23During the Spring Festival, the railway put on trains to make people go home conveniently for the family reunion.
AunusualBregular
CparticularDspecial
24The young man decided to accept the job, so he was asked to his acceptance in writing.
AconfirmBconvey
CconvinceDconsider
25 it is true that a students most important goal is to study well, it doesnt need to be the only goal.
AWhenBWhile
CAsDBefore
26Is this museum you visited a few days age?
AwhereBthat
Con whichDthe one
27Mother bought me a dictionary on my birthday, made me very happy.
AwhatBthat
CwhoDwhich
28Have you ever had a case someone accused your journalists of getting the wrong end of the stick?
AwhichBthat
CwhereDwhen
29She still remembered several occasions in the past she had a similar feeling.
AwhyBwhich
CwhereDwhen
30—What do you think of Mrs.Green?
—She is as you could ever meet.
Aan as kind lady
Bas a kind lady
Ckind as a lady
Das kind a lady
上期答案
语 文
【解析】
答题前,可搁置题干,先把诗歌读懂。紧抓“感情”这一主线,只要大体抓住了作者所抒发的感情,就可以说基本上读懂作品了。先给自己提出第一个问题:这首诗的感情基调是偏重于喜还是偏重于忧(或褒还是贬)。这一提问的实质是要回答“是什么”。带着这一问题粗读该诗,即有诸如“水净”“明眼”“可当山”“无限意”“有余闲”“目随”“坐待”等叙述、描绘性词语从眼前掠过,使我们能够透过这些带有点睛性质的词句,隐隐体会到诗人的愉悦、自得之情,初步得出“这首诗的感情基调偏重于喜”的结论。
提出两个相关问题:第二,为什么喜(褒)或忧(贬);第三,用什么方式表达这种感情的,最主要的表达技巧是什么。这一环节,从逻辑上说,是第一个问题的深入与继续,回答“为什么”和“怎么做”。具体操作上,先要解决第二个问题,回答“为什么”,即要找出“这首诗的感情基调偏重于喜”的根据所在。我们看到,诗人在首句即紧扣题目“后湖”,先写因水之明净而觉眼前一片明澈,次写所居之城因荒僻而“可当山”,这无疑是带有喜悦的感受、感觉。颔联写青林、白鸟,则含蓄地表达了诗人自己的悠闲情怀。颈联中值得注意的是“江湖”一词,暗示了诗人此时正过着隐居生活,无所羁绊,言外不无欣然自得之意。尾联是人、景同写:诗人纵目追随着暮归的大雁,直至在视野中完全消失。雁已归尽,诗人仍旧流连忘返,饶有兴致地坐等着暮鸦归来,散漫闲适之情,溢于言表。
聪明的考生不会放过诗后那条用以提示写作背景的简洁注释,他们会抓住其中“罢归”“赋闲”这些关键字眼,从中看到陶渊明——一个在中学教科书中与之神交已久的辞官归隐田园的形象——的身影,其对准确答题会有很大帮助帮助。
接下来解决第三个问题,这一问题的主旨在于探讨写作手法和表达技巧。目光应聚焦于诗歌的第二联,因为这两句对景物的描写带有明显的拟人化色彩:苍茫的暮色之下,远处蓊蓊郁郁的青林如同怀着无限情意;又见白鸟从容、悠然地归巢于林间,仿佛极有余闲。这里,诗人将树木、白鸟人格化,在某种意义上正是为了自比,以传达诗人自己此时仿佛物我两忘的超然心境。
经过上面步骤的实际操作,依次解决“是什么”“为什么”“怎么做”三个关键问题之后,回答例题中的两个问题就是水到渠成之事了。
【答案】
(1)拟人手法。写青林怀着无限情意;又写白鸟从容、悠然,仿佛极有余闲似的。这里将“青林”“白鸟”人格化,含蓄地表现了诗人悠闲的心境。
(2)抒发了罢归后不再为繁重的公务以及官场的尔虞我诈而劳心费神的自得之情。(此题可以进一步结合试题后的注释做出)
数 学
解:(1)由n∈N*知f(n)=n(n+1-n)+f(n-1)=n+f(n-1),即f(n)-f(n-1)=n,显然
f(1)-f(0)=1
f(2)-f(1)=2
f(3)-f(2)=3
……
f(n)-f(n-1)=n
迭加得:f(n)-f(0)=1+2+3+…+n=n(n+1)2。因f(0)=0,则f(n)=n(n+1)2,即an=n(n+1)2(n∈N*)。
(2)因为x轴、直线x=a与函数y=f(x)的图像所围成的封闭图形的面积为S(a)(a≥0),且f(n)=n(n+1)2。显然,当n=1时,S(1)表以f(1)为底,高为1的直角三角形的面积;当n=2时,S(2)表在S(1)的图形外再增添一个以f(1)为上底,f(2)为下底,高为1的直角梯形的面积;当n=3时,S(3)表在S(2)的图形外再增添一个以f(2)为上底,f(3)为下底,高为1的直角梯形的面积,……同理可得S(n)的图形。
无疑,当n=1时,S(1)-S(0)表-直角三角形的面积,当n≥2(n∈N*)时,S(n)-S(n-1)表上底为f(n-1)、下底为f(n)、高为1的直角梯形的面积。故此
S(n)-S(n-1)=f(n-1)+f(n)2×1=an-1+an2=12n(n-1)2+n(n+1)2=n22。
(3)设存在正整数t,对一切n>t恒成立,因n(n+1)2-1005>n22n2>1005,即n>2010,又T={2000,2002,…,2008,2010,2012,…,2998},则正整数t可取值2010,2012,……,2998。这是首项为2010,公差为2的等差数列。设其项数为n,由
2010+2(n-1)=2998,得n=495。T中共有495个满足条件的正整数t,tmin=2010。
(4)可构造数列bn=1an,因an=n(n+1)2(n∈N*),则bn=2n(n+1)=21n-1n+1,
因b1+b2+…+bn=21-12+12-13+13-14+…+1n-1n+1=21-1n+1,
显然极限存在,且limn→SymboleB@ (b1+b2+…+bn)=limn→SymboleB@ 21-1n+1=2。
综上,构造数列bn=can(c≠0,c为常数),bn=122ann+1,bn=q2ann+1(0<|q|<1)等都能使limn→SymboleB@ (b1+b2+…+bn)存在。
英 语
Keys:1 — 5 CDBCD 6 — 10 BCABC 11 — 15 BCACA 16 — 20 CDBCB
解析:
1从前面的 too 和后面的 over-confident 及结合全文可知年轻人太狂傲。
2上下文线索告诉读者,年轻人自以为是什么事都能做,everything表示一切。
3 ignore 忽略,看不起 ,文章主要讲年轻人看不起老年人。
4文中的作者过去也是这样一个年轻人, was used to 和 got used to 表示习惯于;use to 属干扰项,没这个短语;而used to过去常常。
5作者要和读者分享这个故事,用share sth. with sb。
6文中的故事讲的是一个年轻人看不起老年人,looked down on 看不起;looked up at 仰视、尊敬;looked up 查阅;looked down 低头。
7 a useless life 是先行词,且不表示人,同时所填答案要作后面定语从句的主语。
8 suggested 表建议,后面的从句用虚拟语气,谓语应为 (should) + do 结构。
9 a beautiful garden came into their sight 中的 came into their sight 表示进入视野。
10 falling 指说话时正在掉落的叶子,现在分词表示在进行,而 growing 表示在生长。
11分词的一般式表示的动作和后面谓语动词的动作同时发生,即 hearing 和 smiled的动作同时发生,而 having heard 是完成式,表先发;hearing 的逻辑主语是后面的 the father,表主动,但C、D表被动。
12从后面的 nothing 可看得出是转折关系,应用转折连词 but,而 however 是副词。
13“in + n .”的结构等于副词,silence 是名词,in silence = silently;silent 是形容词;silently是副词;a silence是干扰项。
14 show sth. to sb. 句型结构,“拿……给某人看”。
15 such + a + adj. + n. = so + adj. + a + n.表示“如此……的一个……”。
16“not + every + 单数可数名词”是一个表示半否定的结构,表示“不是每个……都……”。
17 keep sth. in ones mind,固定句式,表示“牢记……在心”。
18 a lot 是 taught me 的程度状语;a lots 是干扰项;a lot of = lots of 后接名词。
19上下文说年长的人有生活社会经验,故选用 experienced,且第一段也有提示;ripe表示水果等熟透了;silly 意思不合文意;green“没经验” 或“(水果)生的”。
20 one 代表前面的单数名词,而 ones 代表前面的复数名词;things 泛指东西、事情;items 条目、款项、项目等;ones 代表前面的 walnuts 或指“人”的概念,而且前面有they are 这一提示。
责任编辑 刘 静 李婷婷 张丹凤