新外研七下Unit3 Food matters Presenting ideas&Reflection分层练习(含解析)

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新外研七下Unit3 Food matters Presenting ideas&Reflection分层练习(含解析)

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Unit 3 Food matters
Presenting ideas&Reflection分层练习
Part 1基础达标
一、单项选择
1.“One is never too old to learn” ______ “活到老,学到老”in Chinese.
A.says B.means C.speaks D.talks
2.— Can you ________ the housework when I go shopping, Jenny
— Sure, Mom.
A.take out B.take away C.take up D.take over
3.Many students get lost ________ computer games and forget all the other things.
A.to B.on C.in D.of
4.I am very hungry because I went to school ________ breakfast.
A.with B.without C.for D.after
5.Fun can ________ us feeling happy and youthful.
A.bring B.take C.keep D.explore
6.She can’t sleep well because she suffers ________ the pain in the back.
A.for B.of C.to D.from
7.I didn’t go to bed ________ I finished my homework last night.
A.after B.if C.when D.until
8.There are ________ students visiting the museum. ________ them is about 200.
A.a number of; A number of B.the number of; The number of
C.a number of; The number of D.the number of; A number of
9.— What are the ________ of Anhui cuisine
— I think Roast Chicken, Fuliji Style is one of them.
A.meanings B.secrets C.symbols D.choices
10.—Do you like ________
—Yes, I do. They are sweet.
A.banana B.a banana C.bananas D.a bananas
11.—Do you like tomatoes
—________. I like carrots.
A.Yes, I do B.No, I don’t C.Yes, I am D.No, I am not
12.—Is this your pen
—No, ________ is red.
A.my B.mine C.I D.me
13.—Which sport do you prefer, running or swimming
—________. I like playing basketball best.
A.Either B.Neither C.Both D.All
14.—What a(n) ________ book! I couldn’t put it down.
—Yes, it’s full of magic.
A.interesting B.interested C.boring D.bored
15.________ my grandma, homemade food is always the best.
A.According to B.Because of C.Instead of D.Thanks to
16.She ________ a cold for three days. She should see a doctor.
A.suffered from B.has suffered from C.suffers from D.will suffer from
17.— Who helped you finish the project
— ________. I did it all by myself.
A.None B.No one C.Both D.Either
18.With the ________ of my teachers, I made great progress in English.
A.support B.encourage C.challenge D.dream
二、用括号中所给单词的适当形式填空
19.Are you able ________ (solve) the problem by yourself
20.If you want to be healthy, you should have a ________ (balance) diet.
21.Let’s talk about the ________ (important) of learning English well.
22.We are no longer children and we can look after ________ (our).
23.Jim invited us ________ (watch) the new film this weekend.
24.— Do you have any good eating habits, Kate
— Of course. I eat a lot of vegetables, such as ________ (onion), carrots and cabbages.
25.It’s important for us ________ (get) more exercise every day.
26.You need a spoon to beat the ________ (mix).
27.Let’s guess the ________ (mean) of the new words in the text.
28.People in ________ (west) countries often use forks and knives to eat.
29.The pen isn’t ________ (I). Maybe it’s Tom’s.
30.Don’t eat too many ________ (snack). They are bad for your health.
31.They have ________ (prepare) for the sports meeting for a whole month.
32.With the support of his family, he ________ (realize) his dream of becoming a runner.
33.The food on the table ________ (smell) so delicious that I can’t wait to try it.
34.It’s important for us ________ (learn) to look on the bright side of life.
35.Neither my brother nor I ________ (like) playing football. We prefer basketball.
36.The little girl enjoys ________ (listen) to English songs before going to bed.
Part 2 能力提升
三、句子翻译
37.情况在渐渐地发生变化。
The situation was changing ________ ________ ________.
38.由于天气不好,我们决定推迟旅行。
________ ________ the bad weather, we decided to put off our trip.
39.这些科学家找到了使我们精神振奋的新方法。
These scientists found new ways to ________ ________ ________ .
40.我进入房间后,打开了空调。
When I entered the room, I ________ ________ the air conditioner.
41.不愿意听他人的建议是错误的。
It’s wrong to ________ ________ ________ others’ advice.
四、用括号中所给词的适当形式完成短文
Tanghulu is a popular sweet treat (甜食) in China. People started to eat it about 800 years ago. Now it is very popular 42 South Korea.
Tanghulu is very beautiful, and it 43 (look) like small colourful glass balls. When Chinese people bring the sweet treat to South Korea, people there fall in love with the 44 (beauty) treat quickly.
At first, Tanghulu is 45 street food in some famous tourist spots (旅游景点) in South Korea. Over time, a lot more people get 46 (know) about it and love it. Now, you can 47 (find) Tanghulu shops everywhere in South Korea. Dalkom Wang Ga Tanghulu is a big Tanghulu company (公司) there. The number of 48 (it) stores goes from only 50 to over 300 in only five months. And it is keeping 49 (grow).
Today, if you walk on the streets of South Korea, you can find a Tanghulu shop to enjoy the sweet treat easily. Many people also learn to make Tanghulu at home. Then they take 50 (photo) and tell others how to make it online.
Tanghulu looks beautiful 51 tastes great. Who doesn’t like it
Part 3拓展培优
五、完形填空
The taste and smell of a 52 food bring back our memories. What food 53 strong in your memory
Food builds a strong 54 between my mum and me. My mother 55 her love for me in many ways, one of which is to cook delicious food for me. My mum can do magic in the kitchen. She can turn tofu and beef into mapo tofu; she can make carrots and mutton become lovely dumplings; a fat 56 can be a pot of chicken soup; even eggs and green onions become pancakes. So my food memories start with my mum.
57 , I like porridge best. I can often smell the porridge when I 58 in the morning. Usually, there are different kinds of porridge: sweet eight-treasure porridge or porridge with pork and eggs. Each kind of porridge tastes great. My mum always makes rice porridge for me when I am ill and I think it’s a better medicine than the other 59 . On any Chinese 60 , the porridge is plain, but it’s the best food in my world.
Now, I’m studying in a new city away from home, but the 61 old memories are still in my heart. Do you have any food memories
52.A.plastic B.certain C.serious D.wild
53.A.becomes B.sounds C.remains D.feels
54.A.purpose B.achievement C.mistake D.connection
55.A.proves B.regrets C.refuses D.follows
56.A.hen B.duck C.cow D.pig
57.A.Nearly B.Finally C.However D.Suddenly
58.A.get lost B.die out C.turn around D.wake up
59.A.biscuits B.pills C.cabbages D.sandwiches
60.A.record B.note C.menu D.form
61.A.nervous B.sweet C.empty D.scary
六、阅读理解
①Numbers are not just numbers. They have some meanings. Let’s see some of the lucky (幸运的) and unlucky numbers in the world.
②As for the number 3, people in Sweden think all good things come in threes. But people in Japan don’t think so. They don’t like taking photos when there are only 3 people. They think something bad (不好的) will come for the one in the middle.
③Chinese people don’t like the number 4 because it sounds like the Chinese pinyin “si”. But people in Australia love this number. They think four is the top pick for them to get new phone numbers or room numbers.
④In China, people think the number 6 means everything goes well. But the number 6 is not welcome in most English-speaking countries.
⑤Some people think lucky numbers are just for fun. In my eyes, if some numbers make you feel lucky, just use them as you like. But remember to work hard at the same time. I think it’s hard work that really brings people good luck, not just the numbers.
62.Which may bring good luck to people according to (根据) this passage
A.Sato from Japan takes photos with his two friends.
B.Frank from Sweden opens his new shop on March 3rd.
C.Li Ming gives 666 yuan to his friend from the UK as gift money.
63.The underlined words “the top pick” in Paragraph 3 mean ________.
A.the last one B.the best one C.the same one
64.Which one can best show the structure (结构) of this passage
A. B. C.
65.________ is the most important thing for us in the writer’s eyes.
A.The lucky number B.Hard work C.Happy mind
66.What does the passage mainly talk about
A.How to choose our lucky number.
B.What numbers mean all over the world.
C.Why some people don’t like the number 4.
试卷第1页,共3页
试卷第1页,共3页
参考答案
1.B
【详解】句意:“One is never too old to learn”在汉语中意思是“活到老,学到老”。
考查动词辨析。says说;means意思是;speaks说(语言);talks谈论。根据句意,此处表示“某句话在中文中的含义”,means符合。故选B。
2.D
【详解】句意:——Jenny,我去购物时你能接手家务吗?——当然可以,妈妈。
考查动词短语辨析。take out取出;take away拿走;take up开始从事;take over接管/接手。根据语境,妈妈要去购物,需要Jenny接手家务,take over符合“接管/接手”的含义。故选D。
3.C
【详解】句意:许多学生沉迷于电脑游戏,忘记了所有其他事情。
考查介词辨析。to向,到;on在……上面;in在……里面;of……的。根据“computer games and forget all the other things”可知,此处表示许多学生深深地沉浸在电脑游戏中,以至于忘记了其他事情。固定搭配get lost in意为“沉迷于,迷恋于”,符合语境。故选C。
4.B
【详解】句意:我很饿,因为我去上学时没有吃早饭。
考查介词辨析。with和……一起;without没有;for为了;after在……之后。根据前文“I am very hungry”可知,上学时没有吃早饭,因此用“without”表示“没有”。故选B。
5.C
【详解】句意:乐趣能让我们保持快乐和年轻的感觉。
考查动词辨析。bring带来;take带走;keep保持;explore探索。根据“Fun can...us feeling happy and youthful.”和常识可知,乐趣的作用是让人持续处于开心和年轻的状态,keep sb. doing sth.“使某人保持某种状态”。故选C。
6.D
【详解】句意:她睡不好,因为她遭受背部疼痛的折磨。
考查介词辨析。for为了;of……的;to向;from来自。suffer from为固定搭配,意为“遭受……之苦”。故选D。
7.D
【详解】句意:昨晚我直到完成作业才睡觉。
考查连词辨析。after在……之后;if如果;when当……时;until直到。根据句意和句型“didn’t go to bed until…”直到……才睡觉可知,此处应使用until表示“直到完成作业才睡觉”。故选D。
8.C
【详解】句意:有许多学生正在参观博物馆。他们的数量大约是200。
考查固定短语辨析。a number of许多,修饰可数名词复数;the number of……的数量。根据第一空后students可知表示“许多学生”,应用a number of;第二空表示学生的数量,用The number of。故选C。
9.C
【详解】句意:——安徽菜的代表是什么?——我认为符离集烧鸡是其中之一。
考查名词辨析。meanings含义;secrets秘密;symbols象征/代表;choices选择。根据答语“Roast Chicken, Fuliji Style is one of them”可知,问句在询问安徽菜的“代表菜”或“标志性菜肴”,symbols符合语境。故选C。
10.C
【详解】句意:——你喜欢香蕉吗?——是的,我喜欢。它们很甜。
考查可数名词的单复数用法。banana香蕉,单数;a banana一根香蕉;bananas香蕉,复数;a bananas错误表达,单数冠词不能修饰复数名词。根据答语“They are sweet.”中的“They”可知,此处指代复数意义的“香蕉”,因此问句中应使用复数形式bananas。故选C。
11.B
【详解】句意:——你喜欢西红柿吗?——不,我不喜欢。我喜欢胡萝卜。
考查一般疑问句。Yes, I do是的,我喜欢;No, I don’t不,我不喜欢;Yes, I am是的,我是;No, I am not不,我不是。根据答语“I like carrots.”可知,说话人喜欢胡萝卜,因此对“tomatoes”应是否定回答。问句“Do you like... ”需用助动词do回答。故选B。
12.B
【详解】句意:——这是你的钢笔吗?——不,我的(钢笔)是红色的。
考查名词性物主代词。my我的,形容词性物主代词;mine我的,名词性物主代词;I我,主格;me我,宾格。根据答语“No,...is red.”可知,此处需用名词性物主代词mine代替“my pen”,避免重复。故选B。
13.B
【详解】句意:——你更喜欢哪项运动,跑步还是游泳?——两项都不喜欢。我最喜欢打篮球。
考查代词辨析。either两者中的任意一个;neither两者都不;both两者都;all三者及三者以上都。根据“I like playing basketball best.”可知,回答者最喜欢篮球,因此对跑步和游泳都不喜欢。故选B。
14.A
【详解】句意:——多么有趣的一本书啊!我简直爱不释手。——是啊,它充满了魔力。
考查形容词辨析。interesting有趣的,形容事物本身;interested感兴趣的,形容人的感受;boring无聊的,形容事物本身;bored感到无聊的,形容人的感受。根据“I couldn’t put it down”可知,这本书本身很吸引人,此处形容“书有趣”,是形容事物,interesting符合语境。故选A。
15.A
【详解】句意:据我奶奶说,自家做的食物总是最好的。
考查短语辨析。According to根据;Because of因为;Instead of代替;Thanks to幸亏。根据“...my grandma, homemade food is always the best.”可知,句子表达“自家做的食物总是最好的”这一观点来源是“my grandma”,因此需选择表示“依据或来源”的短语。故选A。
16.B
【详解】句意:她已经感冒三天了。她应该去看医生。
考查动词时态。根据“for three days”可知,句子时态是现在完成时,其结构是“have/has+动词的过去分词”,主语“She”是第三人称单数,所以助动词用has,suffer的过去分词是suffered。故选B。
17.B
【详解】句意:——谁帮助了你完成这个项目?——没有人。我自己一个人做的。
考查代词辨析。None没有;No one没有人;Both两者都;Either两者之一。根据回答“I did it all by myself”可知,此处强调无人帮助,且“no one”专指人,符合语境。故选B。
18.A
【详解】句意:在老师的支持下,我在英语方面取得了很大进步。
考查词汇辨析。support支持;encourage鼓励;challenge挑战;dream梦想。根据“I made great progress in English.”可知,取得进步是由于老师的支持或鼓励,且“the ... of”结构中,需用名词形式,support可作名词。故选A。
19.to solve
【详解】句意:你能自己解决这个问题吗?固定搭配be able to do sth. 意为“能够做某事”。此处应填不定式。故填to solve。
20.balanced
【详解】句意:如果你想保持健康,你应该有均衡的饮食。balance “平衡”,既可作动词,也可作名词,根据此句“you should have a … (balance) diet.”的“a … diet”可知,此处需用形容词修饰“diet”,结合此句的句意,此处表达“均衡的”,需用“balance”的-ed形容词“balanced”,修饰“diet”,表达“均衡的饮食”。故填balanced。
21.importance
【详解】句意:让我们谈论一下学好英语的重要性。根据空前的“the”及空后的“of”可知,此处应该用名词形式,important的名词形式是importance,the importance of“……的重要性”,固定搭配。故填importance。
22.ourselves
【详解】句意:我们不再是孩子了,我们可以照顾自己。固定搭配look after oneself意为“照顾自己”,此处需要使用反身代词;our“我们的”是形容词性物主代词,对应的反身代词是ourselves“我们自己”。故填ourselves。
23.to watch
【详解】句意:Jim邀请我们这个周末去看新电影。根据动词invite的固定用法,invite sb. to do sth.表示“邀请某人做某事”,动词watch用不定式形式。故填to watch。
24.onions
【详解】句意:——凯特,你有什么良好的饮食习惯吗?——当然。我经常吃很多蔬菜,比如洋葱、胡萝卜和卷心菜。根据“...carrots and cabbages”可知,and连接并列名词,carrots and cabbages为复数形式,空格处也应使用复数。故填onions。
25.to get
【详解】句意:每天多锻炼对我们来说很重要。get“得到”,It’s+adj.+for sb. to do sth.(对某人来说做某事是……的),因此填动词不定式。故填to get。
26.mixture
【详解】句意:你需要一个勺子来搅拌混合物。根据句子结构可知,空处作宾语,需用名词形式;mix为动词,其名词形式为mixture,表示“混合物”。此处指的是一次做饭或一次搅拌所得到的整体混合物,是单一概念,因此用单数形式mixture,而不是复数。故填mixture。
27.meanings
【详解】句意:让我们猜一猜课文中新单词的含义。根据完整句子“Let’s guess the…of the new words in the text.”以及所给单词mean可知,空格处应填名词形式meaning。new words为复数,表示多个单词对应多个含义,因此用名词复数形式。故填meanings。
28.western
【详解】句意:西方国家的人们经常用刀叉吃饭。根据英文句子“People in…countries often use forks and knives to eat.”可知,这里需要一个修饰名词countries、表示“西方的”的形容词,western“西方的” (名词west的形容词形式) 符合语境及语法要求。故填western。
29.mine
【详解】句意:这支笔不是我的。它可能是汤姆的。根据“I”和“The pen isn’t...”可知,需填表示“我的”的名词性物主代词,“mine”意为“我的”,符合题意。故填mine。
30.snacks
【详解】句意:不要吃太多零食,它们对你的健康有害。根据“too many”可知,横线处需填名词复数形式,snack“零食”,可数名词,其复数形式为snacks。故填snacks。
31.prepared
【详解】句意:他们已经为运动会准备了整整一个月。prepare“准备”,动词;根据“for a whole month”可知,此处应用现在完成时,其结构为“have/has+动词过去分词”,prepare的过去分词是prepared。故填prepared。
32.realized
【详解】句意:在家人的支持下,他实现了成为一名跑步运动员的梦想。分析语境可知,句子描述的是过去的事情,用一般过去时,动词用过去式realized。故填realized。
33.smells
【详解】句意:桌子上的食物闻起来很香,我都等不及要尝一尝了。smell为感官系动词,food是不可数名词,动词应用第三人称单数形式smells。故填smells。
34.to learn
【详解】句意:对我们来说,学会乐观看待生活很重要。固定句型It’s important for sb to do sth“做某事对某人来说很重要”,it作形式主语,不定式作真正主语,空处用learn“学习”的不定式结构to learn。故填to learn。
35.like
【详解】句意:我哥哥和我都不喜欢踢足球,我们更喜欢篮球。like“喜欢”,根据“neither…nor…”的就近原则,靠近谓语的主语是“I”,且句子描述的是喜好(一般情况),所以用动词原形。故填like。
36.listening
【详解】句意:这个小女孩喜欢在睡觉前听英文歌曲。listen意为“听”,根据“enjoys”可知,此处是enjoy doing sth.,表示“喜欢做某事”,所以空处使用动名词形式作宾语。故填listening。
37. minute by minute
【详解】根据中英文对照可知,此处缺“渐渐地”,固定短语minute by minute意为“渐渐地、一分钟一分钟地”,在句中作状语,修饰动词changing。故填minute;by;minute。
38. Because of
【详解】根据中英文对照可知,此处缺少“由于”。because of“因为,由于”,句子开头首字母大写,后接名词短语the bad weather。故填Because;of。
39. cheer us up
【详解】根据中英文对照可知,此处缺少“使我们精神振奋”。“使振奋”译为固定短语cheer up,宾语“我们”用宾格us,代词需放在短语中间;空前为不定式符号to,故用动词原形。故填cheer;us;up。
40. turned on
【详解】根据中英文对照可知,此处缺少“打开”,turn on是固定动词短语,意思是“打开”,根据“When I entered the room”可知,时态要用一般过去时,turn的过去式为turned。故填turned;on。
41. be deaf to
【详解】根据中英文对照可知,需翻译的是“不愿意听”,其英文表达是“be deaf to”,在“to”后面动词用原形。故填be;deaf;to。
42.in 43.looks 44.beautiful 45.a 46.to know 47.find 48.its 49.growing 50.photos 51.and
【导语】本文作者介绍了中国传统小吃“糖葫芦”在韩国迅速走红。
42.句意:如今它在韩国也非常流行。表示在韩国用介词in。故填in。
43.句意:糖葫芦非常漂亮,它看起来就像彩色的小玻璃球。由“Tanghulu is very beautiful,”可知,句子用一般现在时,主语是it,谓语动词用第三人称单数形式,looks“看起来”。故填looks。
44.句意:当中国人把这种甜食带到韩国时,那里的人很快爱上这种美味的食物。修饰名词treat用形容词beautiful“美丽的”。故填beautiful。
45.句意:最初,糖葫芦只是韩国一些著名旅游景点里的街头小吃。此处泛指“一种街头小吃”,street以辅音音素开头,用不定冠词a。故填a。
46.句意:随着时间推移,越来越多的人开始了解并喜爱它。get to know“开始了解”。故填to know。
47.句意:如今你在韩国到处都能找到糖葫芦店。情态动词can后接动词原形find“找到”。故填find。
48.句意:在短短五个月内,其门店数量从只有50家增加到300多家。修饰空后的名词“stores”,用形容词性物主代词its“它的”。故填its。
49.句意:它还在持续增长。grow“增长”,keep doing“继续做某事”,动名词作宾语。故填growing。
50.句意:然后他们拍照,并且在网上告诉其他人如何制作。take photos“拍照”,此空用复数,表泛指。故填photos。
51.句意:糖葫芦看起来很漂亮,味道也很棒。由“looks beautiful”和“tastes great”可知,两个动词是并列关系,用and连接。故填and。
52.B 53.C 54.D 55.A 56.A 57.C 58.D 59.B 60.C 61.B
【导语】本文通过描述母亲烹饪的各种美食和作者最爱的粥,展现了食物如何成为母子情感的纽带,并唤起温暖的家庭记忆。即使远离家乡,这些甜蜜的回忆仍深藏心底。
52.句意:某种食物的味道和气味会唤起我们的记忆。
plastic塑料的;certain某种的;serious严肃的;wild野生的。根据“The taste and smell of a…food bring back our memories.”可知此处表示特定食物的气味。故选B。
53.句意:什么食物在你的记忆中仍然强烈?
becomes变成;sounds听起来;remains仍然是;feels感觉。根据“…strong in your memory”可知此处询问记忆中持续存在的食物。故选C。
54.句意:食物在我和妈妈之间建立了牢固的联系。
purpose目的;achievement成就;mistake错误;connection联系。根据“builds a strong…”可知此处指建立了联系。故选D。
55.句意:我母亲用多种方式证明她对我的爱。
proves证明;regrets后悔;refuses拒绝;follows跟随。根据“…her love for me”可知是用多种方式证明爱。故选A。
56.句意:一只肥母鸡可以变成一锅鸡汤。
hen母鸡;duck鸭子;cow奶牛;pig猪。根据“chicken soup”可知此处需要能制作鸡汤的家禽。故选A。
57.句意:然而,我最喜欢粥。
Nearly几乎;Finally最终;However然而;Suddenly突然。前文描述多种食物,此处用转折引出最爱的食物。故选C。
58.句意:我早上醒来时经常能闻到粥的香味。
get lost迷路;die out灭绝;turn around转身;wake up醒来。根据时间状语“in the morning”可知此处指早上醒来。故选D。
59.句意:我认为它比其他药片更好。
biscuits饼干;pills药片;cabbages卷心菜;sandwiches三明治。根据“I think it’s a better medicine than…”可知此处指与其他药作比较。故选B。
60.句意:在中国任何菜单上,粥都很普通,但在我的世界里它是最好的食物。
record记录;note笔记;menu菜单;form表格。根据“On any Chinese…the porridge is plain”可知此处指在菜单上。故选C。
61.句意:现在,我虽然在离家很远的城市上学,但甜蜜的旧记忆仍在我心中。
nervous紧张的;sweet甜蜜的;empty空的;scary可怕的。根据“old memories”的情感色彩,应选择积极形容词。故选B。
62.B 63.B 64.A 65.B 66.B
【导语】本文是一篇说明文,主要讲述了数字不仅仅是数字,它们在不同国家有着不同的幸运和不幸含义,同时作者也表达了自己对于幸运数字的看法,认为努力工作才是真正带来好运的关键。
62.细节理解题。根据文章第二段“As for the number 3, people in Sweden think all good things come in threes.”可知,瑞典人认为所有好事都是成三出现的,所以来自瑞典的弗兰克在3月3日开新店可能会带来好运。A选项中日本人不喜欢3个人一起拍照;C选项中英国人不太欢迎数字6。故选B。
63.词句猜测题。根据文章第三段“But people in Australia love this number. They think four is the top pick for them to get new phone numbers or room numbers.”可知,澳大利亚人喜欢数字4,他们认为4是他们选择新电话号码或房间号码时的“the top pick”,结合语境可推测“the top pick”意为“最好的选择”。故选B。
64.篇章结构题。文章第一段总述数字有不同含义并引出世界上的幸运和不幸数字这一话题;第二、三、四段分别阐述不同国家对数字3、4、6的不同看法,为分述部分;第五段表明作者观点,即努力工作带来好运,为总结部分。所以文章结构为总-分-总。故选A。
65.细节理解题。根据文章第五段“I think it’s hard work that really brings people good luck, not just the numbers.”可知,在作者眼中,努力工作才是最重要的。故选B。
66.主旨大意题。文章主要讲述了数字在不同国家有着不同的幸运和不幸含义,即数字在世界各地的意义。A选项“如何选择我们的幸运数字”和C选项“为什么有些人不喜欢数字4”都只是文章的部分内容,不能概括全文主旨。故选B。
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