8bunit5单元测试题含答案
译林牛津8Bunit5单元
I.词汇(10分)
A.根据句意和所给中文写出句中所缺的单词。
1.—Where 'Mr. Gree n?
—He has gone to atte nd an ________ (国际)meeti ng.
2.1 write to my mother every week, _______ ( 主要)on Sun days.
3.The heavy work ____________ (影响)his health, so he looked much older.
4.Do you know the saying, A friend in need is a friend _______ (真正地).
5.It 'important to ____________ (教育)the young students.
B.根据句意用所给词的适当形式填空。
1.—Do you know the __________ (in terview) on TV?
—Of course. He ' Shui Junyi from CCTV .
2.The doctors didn 'tknow what caused the old man ' __________ (blind).
3.Can I have a _______ (medici ne) exam in ati on today? I don 'feel well.
4.—How is Miss King?
—She is still under ______ (treat) in hospital.
5.Dr. Brow n felt tired because he had two ______ (operate) in the day.
II.选用所给句子完成对话。(5分)
A: We have to meet the others at 8:30 at the reserve(自然保护区),don 'we?
B: (1) _______
A: Do you know how to get there?
B: (2) ________ I t 'll take us about two hours to get there by bus.
A:(3) ________
B: It ' an area that protects lots of different animals.
A:⑷ __________
B: I'm not really sure. I know there are many different kinds of birds there and I m going to take my camera with me.
A: (5) ________ W hat clothes are you going to wear?
B: Well, if it 's wet, I ll wear my strong shoes and take my rain coat with me.
A: So I will.
III.单项选择。(15分)
1.—Is your father a teacher?
—Well, he _______ .
https://www.360docs.net/doc/e81488400.html,ed to
B. was used to
C. used to be
D. is used to be
2.ln the end I _____ hard work.
A.got used to do
B. used to do
C. got used to doing
D. used to doing
3.___________________________________ B lack broke his leg. He has just had _____________ X-ray
exam in ati on. _________________________ doctor said he n eeded _
operati on.
A. a; The; an
B. a; A; an
C. an; A; an
D. an; The; an
4.The patie nts are quite __ to the nu rses for their special care.
A. enjoyable
B. helpful
C. con fide nt
D. grateful
5.—What do cows eat?
—They eat __________ grass.
A. most
B. mostly
C. almost
D. main
6.1 ' m sorry, I ________ the book in my home.
A. forget
B. forgot
C. left
D. leave
7.The gover nment will _____ more colleges for more stude nts to receive higher educati on.
A. set up
B. send up
C. set out
D. use up
8.—How do you usually study for a test?
—I study ___________ .
A. with see ing En glish-la nguage videos
B. with watch ing En glish-la nguage videoes
C.by watch ing En glish-la nguage videoes
D. by watch ing En glish-la nguage videos
9.Do you have ____ t o say about your family ?
A . else anything
B . else something C. anything else D . something else
10.You ______ to the meet ing this after noon if you have someth ing importa nt to do.
A. n eed n 'tto come
B. don 'tn eed come
C. don'tn eed coming
D. n eed n 'come
11.70% of the earth_____ covered with water.
A. are
B. is
C. were
D. being
12.This book is ____ hard _____ un dersta nd.
A. too; to
B. eno ugh; to
C. so; to
D. so; that
13.With the money ______ he had saved, he went on with his studies.
A. that
B. what
C. who
D. where
14.—Do you spe nd a lot of time computer?
—No, but I spe nd much time ___ doing my homework.
A. on; in
B. in; on
C. on; on
D. in; in
15.—Would you like ______ the en viro nment?
—I don 'tknow. What can I do?
A. help save
B. help ing save
C. to help savi ng
D. to help save
IV.句型转换。(10分)
A.按要求变换句型。
1.He used to walk to school.(改为一般疑问句)
_____ h e _____ to walk to school.
2.Danny asked Sandy if she could swim.(改为直接引语)
Danny asked, “ ___________ s wim, Sandy? ”
3.Sim on said, “ am very busy. ” 改为间接引语)
Simo n said that __________ v ery busy.
4.The teacher said to him, Don 'sleep in class.”改为间接引语)
The teacher told him ________________ i n class.
5.His uncle is a doctor.(对划线部分提问)
_____________ his uncle _______ ?
B.同义句转换
1.I used not to like Peking Opera.
I __________ to like Peking Opera.
2.The sick boy n eeds an operati on.
The sick boy n eeds to be _________________ .
3.There'se no ugh time, so you n eed n 'hurry.
There's eno ugh time, so you __________________ hurry.
4.Father tells Daniel not to play computer games.
Father ______ Daniel _____________ c omputer games.
5.We will start a shopp ing mall over there.
We will _________________ a shopp ing mall over there.
V.单句改错。(5分)
( )1. I'm used to live in the country now. _____
ABC D
( )2. The teacher told us that light traveled faster tha n sound.
A B C D
( )3. They says they will go there by the plane. ______
A B CD
( )4. The patie nt 'family are watching the operati on with video. __
A B C D
( )5. The policema n preve nted the children not to play football on the busy road. ___
ABC D
VI.根据汉语提示完成句子。(10分)
1.他没有足够的钱进行医疗诊治。
He doesn ' have ______ money ______________________ .
2.那儿过去有个教堂。
There ___________________ a church there.
3.医生将对她动手术来医治她的疾病。
The doctors will _________________________ her for her ill ness.
4.人们通过向希望工程捐助帮助贫困地区的学校和学生。
People help schools and stude nts in __________ by ________________ t o ______________ . 5.教练告诉他们继续训练。
The coach told them to__________________ the _______ .
6.我们把英语老师当作我们的好朋友。
We _____ our En glish teacher ____ o ur good friend.
7.你还有其它什么要说的吗?
Do you have ___________________________________________ ?
8.这所学校什么时候创办的?
When ________ the school __________________ ?
9.你通常如何花费你的零用钱?
How do you usually ______ your _____________________ ?
10.她只想着自己,从不关心他人。
She only _____________ herself and doesn ' _______________________ o thers.
VII.完形填空。(10分)
A professor(教授)told his students to go into the city slums(贫民窟)to study the life of 200 boys. He asked them to _1_reports about each boy ' s life and future. Every one of the students wrote,
“ He doesn ' t have any hope. ”
Twenty-five years 2 , another professor read about the earlier study. He told his students to
3 what had happe ned to the boys. They tried very had and found that 176 of the boys had became successful
4 doctors, teachers and scientists.
The professor was very 5 a nd decided to study it further. Luckily, all the men were livi ng n ear the place and he was able to ask each one. What made you 6 ? Each one answered, There was a teacher”The teacher was 7 liv ing there, so the professor found her and asked the old woma n 8 she had used to pull those boys 9 the slum, and change them into successful people.
The teacher's 10 bega n to shine and said with a sweet smile, It' really very easy. I love those boys."
1.A. read B. study C. write D. take
2.A. later B. after C. ago D. before
3.A. search B. find out C. look for D. see
4.A. for B. with C. as D. like
5.A. glad B. angry C. surprised D. worried
6.A. won derful B. successful C. rich D. popular
7.A. already B. yet C. even D. still
8.A. what B. who C. which D. whe n
9.A. out B. i nto C. away D. out of
10.A. face B. eye C. hair D. mouth
VIII.阅读理解。(20分)
A
Weari ng the wrong type of glasses will do harm to your eyes. This is not true for adults, although
in correct glasses may not be good for childre n un der 10. Ready-made glasses, and not weari ng whe n you should, won't do harm to your eyes, but you may see better with glasses that are specially made for you.
Watching too much television is bad for your eyes. This is not true. People with easily affected eyes may find they get red and aching from staring at a fixed distance for long periods, but there won't be any last ing effects.
Carrots will help you see in the dark. Carrots are rich in beta-carote ne, which the body can cha nge into vitamin A, too little of which can cause night blindness. However, people in most countries
don't need to worry about vitamin A deficiency(缺乏),night blindness is more likely to be conn ected with ano ther visi on problem.
1.According to the passage, which of the following is TRUE?
A.Ready-made glasses will do harm to on e's eyes.
B.Weari ng the wrong glasses may do harm to childre n's eyes.
C.The human body is unable to change beta-carotene into vitamin A.
D.Watch ing less televisi on may do harm to childre n's eyes.
2.Night bli ndn ess is most likely caused by _ .
A. staring for long periods
B. too much beta-carotene
C. not eno ugh vitam in A
D. visi on problems
3.Accord ing to the article, eye problems can be corrected by ___ .
A. weari ng specially-made glasses
B. perform ing eye exercises
C. cutt ing back on televisio n
D. eat ing more carrots
4.Watching too much television can cause ______ .
A. night blindness
B. lasting eye problems
C. a number of vision problems
D. eye trouble for a limited time
5.The main purpose of this article is to __ .
A. tell people of the importance of their eyes
B. tell people how to protect their eyes
C. tell people to have more carrots
D. tell people something more about their eyes
B
Schools and parents in Shenzhen City have been asked to take better care of children 's eyesight as 45 percent of them were found to be shortsighted. Too much reading, poor lighting and too much
TV are blamed(责备).Of the city ' high school graduates毕业生)who applied to study at colleges this summer, two thirds had to have their choices limited because of poor eyesight. Shenzhen Special Zone Daily said.
1.The purpose of this passage is to ________ .
A.criticize(批评) children who are shortsighted.
B.blame parents and schools for children 's being shortsighted.
C.ask the high school graduates to pay attention to their eyesight.
D.draw people ' special attention to eye hygiene(卫生).
2.Only _______ of the children in Shenzhen City have good eyesight.
A. 45 percent
B. less than half
C. 55 percent
D. two thirds
3.Generally speaking, high school students have _____ e yesight than primary school students.
A. poorer
B. better
C. brighter
D. good
4.Because of being shortsighted many school graduates _______ .
A. weren 'tallowed to enter college
B. couldn 'tgraduate from high school
C. couldn 'tchoose to study what they liked best
D. lost their limited time
5.In order to take care of eyes, children shouldn 't __ .
A. read books
B. watch TV
C. make their eyes too tired
D. see things far away
IX. 书面表达。(15 分)
小红、小明和小刚是第一中学的三个学生。他们根据自己的兴趣和爱好,每周花几个小时的时间参加不同的志愿者工作。根据以下要点,以“ Being a volunteer is great ”为题,写出他们的志愿者工作及他们的感受。60-80 字左右。
1.小红到小学帮助小学生阅读;
2.小明到动物医院照料动物;
3.小刚到医院给病人演唱歌曲;
4.参加志愿者的感受等。
Being a volunteer is great
No. 1 Middle School is proud of three students. They are ____________________________________
牛津8Bunit5 单元测试题参考答案
A. 1. international 2. mostly 3. affected 4. indeed 5. educate
B. 1. interviewer 2. blindness 3. medical 4. treatment 5. operation
II.
1-5 DBCAE
III.
1-5CCDDB 6-10CADCD11-15BAAAD
IV.
A. 1. Did, use 2. Can you 3. he was 4. not to sleep 5. What does; do
B. 1. didn 'tuse 2. operated on 3. don 't need/have to 4. prevents/stops/keeps; from playing 5. set up
V.
1. C. live 改为living。
2. C. traveled 改为travels。
3. D. by 改为on。
4. D. by 改为on。
5. B. not to play 改为from playing 。
VI.
1. enough; for medical treatment
2. used to be
3. perform/do an operation on
4. poor areas; sending donations; Project Hope
5. carry on with; training
6. treat; as
7. anything else to say
8. was; set up
9. spend; pocket money 10. thinks of; care about
VII
1-5CABCC 6-10BDADB
VIII
A.1-5 BDADD
B.1-5BCACC
IX.
Being a volunteer is great
No. 1 Middle School is proud of three students. They are Xiaoming, Xiaohong and Xiaogang. Every week they work as volunteers at different places. Xiaohong enjoys reading, so after class she spends some time reading together with the students in a primary school. Animals are Xiaoming 's favorites, so he often goes to animal hospital. In the hospital he can not only look after the sick animals, but also learn how to treat them. Xiaogang has sweet voice, as a result, he spends much of his free time singing for the patients in the hospital. He sings songs and smile to those patients.
They all think what they are doing is right. How great it is to be a volunteer!
I.
第六单元测试卷(含答案)
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初中数学:《概率初步》单元测试(含答案)
初中数学:《概率初步》单元测试(含答案) 一、选择题 1.从编号为1到10的10张卡片中任取1张,所得编号是3的倍数的概率为( ) A . 110 B . 210 C . 310 D .15 2. 下列说法正确的是 (A)某市“明天降雨的概率是75%”表示明天有75%的时间会降雨 (B)随机抛掷一枚均匀的硬币,落地后正面一定朝上 (C)在一次抽奖活动中,“中奖的概率是 1 100 ”表示抽奖l00次就一定会中奖 (D)在平面内,平行四边形的两条对角线一定相交 3.盒子里有3支红色笔芯,2支黑色笔芯,每支笔芯除颜色外均相同.从中任意拿出一支笔芯,则拿出黑色笔芯的概率是( ) A .23 B . 15 C . 25 D . 35 4.同时抛掷两枚质地均匀的骰子,骰子的六个面分别刻有1到6的点数,朝上的面的点数中,一个点数能被另一个点数整除的概率是( ) A. 718 B.34 C.1118 D.2336 5. 在一张边长为4cm 的正方形纸上做扎针随机试验,纸上有一个半径为1cm 的圆形阴影区域,则针头扎在阴影区域内的概率为 A. 161 B.41 C.16 π D. 4 π 6. 将1、2、3三个数字随机生成的点的坐标,列 成下表。如果每个点出现的可能性相等,那么从中任意取一点,则这个点在函数y=x 图象上的概率是 A .0.3 B .0.5 C .13 D .2 3 7. 下图是同一副扑克中的4张扑克牌的正面,将它们正面朝下洗匀后放在桌上,小明从中抽出一张,则抽到偶数的概率是( )
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必修五数列单元测试
必修五数列复习综合练习题 一、选择题(本大题共12小题,每小题5分,共60分,在每小题给出的四个选项中,只有一项是符合题目要求的) 1.2011是等差数列:1,4,7,10,…的第几项( ) (A )669 (B )670 (C )671 (D )672 2.数列{a n }满足a n =4a n-1+3,a 1=0,则此数列的第5项是( ) (A )15 (B )255 (C )20 (D )8 3.等比数列{a n }中,如果a 6=6,a 9=9,那么a 3为( ) (A )4 (B )2 3 (C ) 9 16 (D )2 4.在等差数列{a n }中,a 1+a 3+a 5=105,a 2+a 4+a 6=99,则a 20=( ) (A )-1 (B )1 (C )3 (D )7 5.在等差数列{a n }中,已知a 1=2,a 2+a 3=13,则a 4+a 5+a 6=( ) (A )40 (B )42 (C )43 (D )45 6.记等差数列的前n 项和为S n ,若S 2=4,S 4=20,则该数列的公差d=( ) (A)2 (B)3 (C)6 (D)7 7.等差数列{a n }的公差不为零,首项a 1=1,a 2是a 1和a 5的等比中项,则数列的前10项之和是( ) (A )90 (B )100 (C )145 (D )190 8.在数列{a n }中,a 1=2,2a n+1-2a n =1,则a 101的值为( ) (A )49 (B )50 (C )51 (D )52
9.计算机是将信息转化成二进制数进行处理的,二进制即“逢二进一”,如 (1101)2表示二进制的数,将它转化成十进制的形式是1×23+1×22+0×21+1×20=13,那么将二进制数16111???位 转换成十进制数的形式是( ) (A )217-2 (B )216-1 (C )216-2 (D )215-1 10.在等差数列{a n }中,若a 1+a 2+a 3=32,a 11+a 12+a 13=118,则a 4+a 10=( ) (A )45 (B )50 (C )75 (D )60 11.(2011·江西高考)已知数列{a n }的前n 项和S n 满足:S n +S m =S n+m ,且a 1=1,那么a 10=( ) (A )1 (B )9 (C )10 (D )55 12.等比数列{a n }满足a n >0,n=1,2,…,且a 5·a 2n-5=22n (n ≥3),则当n ≥1时,log 2a 1+log 2a 3+…+log 2a 2n-1=( ) (A )n(2n-1) (B )(n+1)2 (C )n 2 (D )(n-1)2 二、填空题(本大题共4小题,每小题5分,共20分,请把正确的答案填在题中的横线上) 13.等差数列{a n }前m 项的和为30,前2m 项的和为100,则它的前3m 项的和 为______. 14.(2011·广东高考)已知{a n }是递增等比数列,a 2=2,a 4-a 3=4,则此数列的公比q=______. 15.两个等差数列{a n },{b n }, 12n 12n a a a 7n 2 b b b n 3 ++?++= ++?++,则55a b =______. 16.设数列{a n }中,a 1=2,a n+1=a n +n+1,则通项a n =_____.
《数列》单元测试题(含答案)
《数列》单元练习试题 一、选择题 1.已知数列}{n a 的通项公式432--=n n a n (∈n N *),则4a 等于( ) (A)1 (B )2 (C )3 (D )0 2.一个等差数列的第5项等于10,前3项的和等于3,那么( ) (A )它的首项是2-,公差是3 (B)它的首项是2,公差是3- (C )它的首项是3-,公差是2 (D )它的首项是3,公差是2- 3.设等比数列}{n a 的公比2=q ,前n 项和为n S ,则 =24a S ( ) (A )2 (B)4 (C)2 15 (D )217 4.设数列{}n a 是等差数列,且62-=a ,68=a ,n S 是数列{}n a 的前n 项和,则( ) (A)54S S < (B )54S S = (C)56S S < (D )56S S = 5.已知数列}{n a 满足01=a ,133 1+-=+n n n a a a (∈n N*),则=20a ( ) (A)0 (B)3- (C )3 (D) 23 6.等差数列{}n a 的前m 项和为30,前m 2项和为100,则它的前m 3项和为( ) (A)130 (B)170 (C)210 (D)260 7.已知1a ,2a ,…,8a 为各项都大于零的等比数列,公比1≠q ,则( ) (A)5481a a a a +>+ (B )5481a a a a +<+ (C)5481a a a a +=+ (D )81a a +和54a a +的大小关系不能由已知条件确定 8.若一个等差数列前3项的和为34,最后3项的和为146,且所有项的和为390,则这个数 列有( ) (A )13项 (B)12项 (C)11项 (D)10项 9.设}{n a 是由正数组成的等比数列,公比2=q ,且30303212=????a a a a ,那么 30963a a a a ???? 等于( ) (A)210 (B)220 (C)216 (D)215 10.古希腊人常用小石子在沙滩上摆成各种形状来研究数,比如:
人教版数学六年级上册《第六单元综合测试卷》含答案
人教版数学六年级上学期 第六单元测试 一、填空题。(7题2分,其余每空1分,共23分) 1.( )÷8=() () =0.625=( )%=( )∶( ) 2.甲数比乙数多25%,甲、乙两数的比是( )∶( ),乙数比甲数少( )%。3.学校买回50个乒乓球,打比赛用掉了28个,用掉了( )%,还剩下( )%。4.抽样检测一批产品,23件合格,2件不合格。这批产品的合格率是( )%。 5.小华读一本书,第一天读了这本书的20%,第二天读了余下的30%,第二天读了这本书的( )%。 6.六(1)班今天到校47人,2人请事假,1人请病假。今天的出勤率是( )%。 7.把7 8 ,0.8,0.87,86%按从小到大的顺序排列是( )。 8.六(2)班会打羽毛球的有12人,会打乒乓球的有15人,会打羽毛球的比会打乒乓球的少( )%,会打乒乓球的比会打羽毛球的多( )%。 9.75千克增加20%是( )千克,60吨减少15%是( )吨。 10.油菜籽的出油率是35%,400千克油菜籽可以榨油( )千克;要榨210千克菜籽油,需要( )千克油菜籽。 11.一台笔记本电脑原价5000元,先降价10%后又降价10%,那么现价是( )元。 二、判断题。(共5分) 1.1公顷相当于1平方千米的1%。( ) 2.1吨煤,用去4 5 ,还剩下20%吨。( ) 3.一件毛衣比一条裤子贵25%,那么一条裤子比一件毛衣便宜25%。( ) 4.在50的后面添上百分号,这个数就缩小到它的 1 100 。( ) 5.一件商品,先提价5%后又降价5%,现价与原价相比没有变化。( )
三、选择题。(共10分) 1.下面的数能用百分数表示的是( )。 A .妈妈从超市买回910千克白糖 B .六年级视力不好的同学占13 C .一根彩带长78米 D .一辆汽车从甲城开往乙城用了45 小时 2.在400克水中加入100克盐,这种盐水的含盐率是( )。 A .80% B .25% C .20% D .40% 3.300件纺织品的合格率是98%,有( )件不合格。 A .2 B .4 C .6 D .8 4.甲、乙两数都不为0,甲数的60%等于乙数的75%,那么甲数和乙数比较,( )。 A .甲数大 B .乙数大 C .一样大 D .无法比较 5.修一条路,单独完成,甲队需要6天,乙队需要8天,乙队的工作效率是甲队的( )%。 A .133.3 B .75 C .25 D .45 四、计算题。(共37分) 1. 分数、小数和百分数的互化。(9分) 2.计算下列各题,能简算的要简算。(16分)
人教版九年级数学上概率初步单元测试含答案
第二十五章概率初步单元测试 一、单选题(共10题;共30分) 1、一个暗箱里装有10个黑球,6个白球,14个红球,搅匀后随机摸出一个球,则摸到白球的概率是 A、 B、 C、 D、 2、书包里有数学书3本,英语书2本,语文书5本,从中任意抽取一本,是数学书的概率是() A、 B、 C、? D、? 3、如图,一个圆形转盘被等分成八个扇形区域,上面分别标上1,3,4,5,6,7,8,9,转盘可以自由转动,转动转盘一次,指针指向的数字为偶数所在区域的概率是() A、 B、 C、 D、 4、在一个不透明的袋子中装有除颜色外其它均相同的3个红球和2个白球,从中任意摸出一个球,则摸出白球的概率是() A、 B、 C、 D、 5、下列模拟掷硬币的实验不正确的是()
A、用计算器随机地取数,取奇数相当于下面朝上,取偶数相当于硬币正面朝下 B、袋中装两个小球,分别标上1和2,随机地摸,摸出1表示硬币正面朝上 C、在没有大小王的扑克中随机地抽一张牌,抽到红色牌表示硬币正面朝上 D、将1、2、3、4、5分别写在5张纸上,并搓成团,每次随机地取一张,取到奇数号表示硬币正面朝上 6、明明的相册里放了大小相同的照片共32张,其中与同学合影8张、与父母合影10张、个人照片14张,她随机地从相册里摸出1张,摸出的恰好是与同学合影的照片的可能性是() A、 B、 C、 D、 7、历史上,雅各布.伯努利等人通过大量投掷硬币的实验,验证了“正面向上的频率在 0.5左右摆动,那么投掷一枚硬币10次,下列说法正确的是() A、“正面向上”必会出现5次 B、“反面向上”必会出现5次 C、“正面向上”可能不出现 D、“正面向上”与“反面向上”出现的次数必定一样,但不一定是5次 8、一个不透明的口袋里装有除颜色外都相同的10个白球和若干个红球,在不允许将球倒出来数的前提下,小亮为了估计其中的红球数,采用如下方法:先将口袋中的球摇匀,再从口袋里随机摸出一球,记下颜色,然后把它放回口袋中,不断重复上述过程,小亮共摸了1000次,其中有125次摸到白球,因此小亮估计口袋中的红球大约有()个.
数列单元测试卷含答案
数列单元测试卷 注意事项: 1.本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分. 2.答题前,考生务必将自己的姓名、准考证号等信息填涂在答卷相应位置. 第Ⅰ卷(选择题) 一.选择题:本大题共12小题,每小题5分,共60分。每小题给出的四个选项中,只有一 项是符合题目要求的. 1.数列3,5,9,17,33,…的通项公式a n等于() A.2n B.2n+1 C.2n-1 D.2n+1 2.下列四个数列中,既是无穷数列又是递增数列的是() A.1,1 2, 1 3, 1 4,… B.-1,2,-3,4,… C.-1,-1 2,- 1 4,- 1 8,… D.1,2,3,…,n 3..记等差数列的前n项和为S n,若a1=1/2,S4=20,则该数列的公差d=________.() A.2 C.6 D.7 4.在数列{a n}中,a1=2,2a n+1-2a n=1,则a101的值为() A.49 C.51 D.52 5.等差数列{a n}的公差不为零,首项a1=1,a2是a1和a5的等比中项,则数列的前10项之和是() A.90 C.145 D.190 6.公比为2的等比数列{a n}的各项都是正数,且a3a11=16,则a5=() A.1 C.4 D.8 7.等差数列{a n}中,a2+a5+a8=9,那么关于x的方程:x2+(a4+a6)x+10=0()
A .无实根 B.有两个相等实根 C .有两个不等实根 D .不能确定有无实根 8.已知数列{a n }中,a 3=2,a 7=1,又数列? ?????11+a n 是等差数列,则a 11等于( ) A .0 D .-1 9.等比数列{a n }的通项为a n =2·3n - 1,现把每相邻两项之间都插入两个数,构成一个新的数列{b n },那么162是新数列{b n }的( ) A .第5项 B.第12项 C .第13项 D .第6项 10.设数列{a n }是以2为首项,1为公差的等差数列,{b n }是以1为首项,2为公比的等比数列,则 A .1 033 034 C .2 057 D .2 058 11.设n S 为等差数列{}n a 的前n 项和,且28,171==S a .记[]n n a b lg =,其中[]x 表示不超过x 的最大整数,如[]09.0=,[]199lg =.则b 11的值为( ) C. 约等于1 12.我们把1,3,6,10,15,…这些数叫做三角形数,因为这些数目的点可以排成一个正三角形,如下图所示: 则第七个三角形数是( ) A .27 C .29 D .30 第II 卷(非选择题) 二、填空题(本题共4小题,每小题5分,共20分)
数列的概念单元测试题含答案百度文库
一、数列的概念选择题 1.在数列{}n a 中,12a =,1 1 1n n a a -=-(2n ≥),则8a =( ) A .1- B . 12 C .1 D .2 2.数列{}n a 的通项公式是2 76n a n n =-+,4a =( ) A .2 B .6- C .2- D .1 3.已知数列{} ij a 按如下规律分布(其中i 表示行数,j 表示列数),若2021ij a =,则下列结果正确的是( ) A .13i =,33j = B .19i =,32j = C .32i =,14j = D .33i =,14j = 4.已知数列{}n a ,若()12* N n n n a a a n ++=+∈,则称数列{}n a 为“凸数列”.已知数列{} n b 为“凸数列”,且11b =,22b =-,则数列{}n b 的前2020项和为( ) A .5 B .5- C .0 D .1- 5.在数列{}n a 中,已知11a =,25a =,() * 21n n n a a a n N ++=-∈,则5a 等于( ) A .4- B .5- C .4 D .5 6.已知数列{}n a ,{}n b ,其中11a =,且n a ,1n a +是方程220n n x b x -+=的实数根, 则10b 等于( ) A .24 B .32 C .48 D .64 7.在数列{}n a 中,114a =-,1 11(1)n n a n a -=->,则2019a 的值为( )