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姓名： 班级
Unit 6 When was it invented?
Section B
本课重点 一般过去时态的被动语态。
学会描述物体发明时间及用途的基本句型。
本课难点 一般过去时态的被动语态
常考句型 It was invented in/by/for…
一、单项选择
1．—I often see Peter’s father play basketball on my way to school.
—That’s not strange. Not only Peter but also his father ________ sports.
A．enjoy B．enjoys C．enjoyed D．was enjoyed
【答案】B
【详解】
句意：——在我上学的路上，我经常看到彼得的爸爸打篮球。——这并不奇怪。不仅彼得而且他父亲也喜
欢运动。
考查动词时态及主谓一致。此句是陈述客观事实，句子用一般现在时，排除 C和D选项。not only…but
also连接并列主语时，谓语动词遵循“就近原则”，离其最近的主语his father是单数形式，动词用三单形
式，故选B。
2．In the face of the variation (变异) of the virus, not only China but also other countries ________ to take action
to fight against the crisis (危机).
A．have B．has C．having
【答案】A
【详解】
句意：面对病毒的变异，不仅是中国，其他国家也必须采取行动应对危机。
考查主谓一致。此处缺少谓语动词，排除 C；not only… but also…需满足“就近原则”，谓语动词取决于
“other countries”，是复数，所以用动词原形，故选A。
3．— I have learned many useful sentences, _________ “It’s a piece of cake.” and “Practice makes perfect. ”.
—Great! It is a good way to _________ in a dictionary.A．like; look them up B．as; look for them
C．with; look up to them D．like; look after them
【答案】A
【详解】
句意：——我学了很多有用的句子，比如“小菜一碟”和“熟能生巧”。——太好了！在字典里查它们是
好方法。
考查介词和动词短语辨析。like像、比如，介词；as像、如同，介词；with和……一起；look up查阅（字
典）；look for寻找；look up to敬仰；look after照顾。根据“I have learned many useful sentences, ...“It’s a
piece of cake.” and “Practice makes perfect. ”.”可知，空格后是举例，用“like”，根据“in a dictionary”可知，
空格处表达“查”字典，用“look them up”。故选A。
4．_______ Tom _______ Mary is studying Chinese history. They find it rich and amazing.
A．Both … and B．Not only … but also C．Either … or
【答案】B
【详解】
句意：不仅汤姆而且玛丽都在学习中国历史。他们发现它丰富且神奇。
考查主谓一致。Both … and两者都……；Not only … but also不仅……而且……；Either … or要么……要
么……。根据下文“They find it rich and amazing”可知，两人都在学习中国历史，C选项可排除。且谓语为
is，A选项的谓语通常为are，故选B。
5．Not only oral English but also written English ________ important.
A．is. B．are C．was
【答案】A
【详解】
句意：英语口语和书面语都很重要。
考查be动词。not only…but also…不但……而且……，连接主语时，适用就近远则，谓语动词要与 also后
的主语保持人称和数的一致；由语境可知，此题陈述事实，需用一般现在时，主语 written English 是单数，
因此be动词用is。故选A。
6．Many students’ poor eyesight (视力) is the ________ of reading on phones too often and too long a day.
A．popularity B．cause C．result
【答案】C
【详解】
句意：许多学生的视力差是一天看手机太频繁且看得时间太长的结果。考查名词辨析。popularity流行；cause起因；result结果。根据“Many students’ poor eyesight”可知此处是讲
近视是看手机太频繁且时间太久造成的结果，用result符合语境。故选C。
7．— ________ the students ________ the teacher was waiting for me when I arrived at the school gate.
— What a pity!
A．Neither; nor B．Either; or
C．Both; and D．Not only; but also
【答案】A
【详解】
句意：——当我到达学校门口时，学生和老师都没有等我。——真可怜！
考查连词。Neither; nor既不，也不；Either; or或者，或者；Both; and……和……两者都；Not only; but also
不仅，而且。根据“What a pity!”可知，此处表示他很可怜，因此他到达校门口的时候，学生和老师都没有
等他，故选A。
8．—Wang Yong is a hero in my heart, he became the first deliveryman to offer help to Jinyintan hospital during
the COVID-4.
—Yes. Many of our students ________ him.
A．look forward to B．get on with C．come up with D．look up to
【答案】D
【详解】
句意：——汪勇在我心中是一个英雄，他成为了第一个在新型冠状病毒肺炎期间为金银滩医院提供帮助的
快递员。——是的，我们的很多学生都很敬佩他。
考查动词短语辨析。look forward to期待；get on with与……友好相处；come up with提出；look up to尊敬，
敬佩。根据“Wang Yong is a hero”可知，汪勇是英雄，所以很多学生敬佩他。故选D。
9．This school trip named History and Future is meant to be ________ as well as fun.
A．personal B．professional C．international D．educational
【答案】D
【详解】
句意：这次名为“历史与未来”的学校旅行既有趣又有教育意义。
考查形容词。personal个人的；professional专业的；international国际的；educational教育的；根据“school
trip”及“History and Future”，可知是“历史与未来”的学校旅行，可推测出是教育的，故选D。
10．We need to buy a ________ or the food may go bad soon in such hot weather.
A．fork B．fridge C．plate D．basket【答案】B
【详解】
句意：我们需要买一个冰箱，否则在这么热的天气里食物可能很快就会坏。
考查名词辨析。fork叉子；fridge冰箱；plate盘子；basket篮子。根据“or the food may go bad soon in such
hot weather”可知要想食物不因天气热而坏掉，应该买冰箱。故选B。
11．—Who do you admire most, Yang Ming?
—Zhong Nanshan. Not only I but also my classmates ________ him.
A．look forward to B．look up to C．are up to D．look after
【答案】B
【详解】
句意：——杨明，你最崇拜谁？——钟南山。不仅我而且我的同学都尊敬他。
考查动词短语。look forward to期望；look up to尊敬；are up to该由……负责；look after照顾。根据“Who
do you admire most”可知，此处介绍崇拜的人，因此表示要尊敬的人，故选B。
12．________ my father ________ my mother is able to drive a car. They are good drivers.
A．Neither; nor B．Both; and C．Either; or D．Not only; but also
【答案】D
【详解】
句意：不但我父亲而且我母亲都会开车。他们都是好司机。
考查的是并列连词的辨析。Neither…nor“既不……也不……”；Both…and“两者都”；Either...or“或者……
或者……”；not only…but also“不但……而且……”；根据“They are good drivers.”可知，前句应是说我父
亲和我母亲都会开车，又因为my mother 后面的be动词是is，有就近原则，应用Not only...but also，故选
D。
13．Not only you but also Jane ________ good at playing the piano.
A．is B．are C．was D．were
【答案】A
【详解】
句意：不仅是你，简也擅长弹钢琴。
考查就近原则。本句陈述客观事实，时态是一般现在时，排除CD；not only…but also“不仅……而且”需
满足就近原则，be动词取决于Jane，故选A。
14．The apples are divided ________ two ________. One is for my sister, the other is for me.
A．in; half B．into; halves C．in; halves D．into; halfs【答案】B
【详解】
句意：苹果被分成两半。一半给我妹妹，另一半给我。
考查介词用法及名词复数。be divided into被分成，固定搭配；two后接名词复数，half的复数形式是
halves。故选B。
15．Not only my friends but also I ______ interested in football and Messi is our favourite star.
A．be B．am C．is D．are
【答案】B
【详解】
句意：我和我的朋友们都对足球感兴趣，梅西是我们最喜欢的明星。
考查就近原则和be动词的用法。not only... but also“不仅……而且”，遵循就近原则，空格前的主语 I是第
一人称单数，故be动词用am。故选B。
二、汉译英
1．薯片的历史______________________
2．一位叫乔治的厨师______________________
3．错误地；无意中__________________
4．不够薄________________________________
5．最后____________________________
6．使顾客高兴____________________________
7．大量的盐________________________
8．好长一段时间__________________________
9．在363年_______________________
10．酸的；有酸味的_______________________
【答案】
1．the history of potato chips
2．a cook called George
3．by mistake
4．not thin enough
5．in the end
6．make the customer happy
7．lots/ a lot of salt
8．a long time9．in 363
10．be sour
【解析】
1．名词“薯片”是potato chips，通常用复数形式，…的历史是the history of…，故整个短语翻译为： the
history of potato chips。
2．名词“厨师”是cook，“名叫…的”是用过去分词called引出来做后置定语，故翻译为：a cook called
George。
3．这是一个副词短语，意为“错误地，无意地”，翻译为：by mistake。
4．形容词“薄的”是thin，enough作副词的意思是 "十分地;充分地;足够地;充足地"，通常置于被修饰的
形容词或副词之后，所以enough应置于thin后面，故翻译为：not thin enough。
5．短语“最后、最终”可以翻译为： in the end。
6．“使某人…”是make sb +adj，名词“顾客”是customer，形容词“开心的”是happy，故翻译为：
make the customer happy。
7．短语“大量的”是a lot of/lots of，可以修饰可数名词复数或不可数名词，名词“盐”salt是不可数名词，
故翻译为：lots/ a lot of salt。
8．短语“一段很长的时间”可以翻译为： a long time。
9．“在…年份”使用的时间介词应该是in，其后直接加年份即可，故翻译为：in 363。
10．形容词“酸的”是sour，前面可以加一个be动词来帮助表示这是一个形容词，故翻译为： be sour。
【点睛】
本题第9题出现了“在..年份”，出现了时间介词的选择问题，现总结三个常考的时间介词。at表示时间，
用于钟点前，用于时刻前，译为"在......时（刻）"。例如：at three／three o'clock 在三点。at noon 在中午，
at night 在夜晚， at midnight 在半夜，at breakfast／lunch／supper 在吃早饭／午饭／晚饭时。in表示时间，
用于泛指一天的上午、下午、晚上等；或用于某个较长的时间，如年、月、季节等。如：in the morning／
afternoon／evening在上（下午）或晚上，in 503在503年，in the day／daytime在白天，in还可以表示"从
现在起一段时间以后"。on表示时间，用于星期、日期（包括该天的各部分）。如：on Sunday／Sundays，
on Monday morning／afternoon／evening等。on也用于某一日的名词前，用于公共节假日前。
三、根据汉语或首字母提示填空
1．Can you help me _____(烧开) water?I am too busy now.
【答案】boil
【详解】
句意：你能帮我烧开水吗？我现在太忙了。help sb. do帮助某人做某事；根据句意语境和汉语提示，可知填boil。
2．The teacher____(分开)the class and took half of the students to the library and left the other write an article.
【答案】divided
【详解】
句意：老师把全班学生分开，把一半学生带到图书馆，留下另一半学生写文章。took是take的过去式，因
此and前面的分句的时态也应为一般过去时，答案为divided。
3．China does a lot of______(贸易)with many countries.
【答案】trade
【详解】
句意：中国与许多国家进行了大量贸易。trade with与…进行贸易/ 交换，固定短语。根据句意语境和汉语
提示，可知填trade。
4．The problem was very difficult. It took Bob _____(差不多) twenty minutes to work it out.
【答案】nearly
【详解】
句意：这个问题很难解决。鲍勃花了将近二十分钟的时间解决了这个问题。take是动词，需用副词修饰；
根据句意语境和汉语提示，可知填nearly。
5．The ______(气味) in the room is terrible.Could you please open the window?
【答案】smell
【详解】
句意：房间里的气味很难闻，请把窗户打开好吗？定冠词 the后接名词；根据句意语境和汉语提示，可知
填smell。
6．That plant can be m___________ into many useful things.
【答案】(m)ade
【详解】
句意：那种植物可以被制成许多有用的东西。短语“被制成”是be made into，故这里需要填写过去分词
made。
7．The chips taste very c________. Even the old can eat them.
【答案】(c)rispy
【详解】
句意：这些薯片尝起来很脆，即便是老人也可以吃掉它们。taste意为：尝起来，其后加形容词表示“尝起
来…”，薯片尝起来应该是“脆的”，故填形容词(c)rispy。8．When was the old bridge b_________?
【答案】(b)uilt
【详解】
句意：这座旧桥什么时候建成的? 桥只能是“被建成”，所以需要使用被动语态 be done，动词“修建”是
build，过去分词是built，“过去被建成”是was built，故填(b)uilt。
9．Those flowers p________ a nice smell.
【答案】produce
【详解】
句意：那些花能产生好闻的气味。主语是flowers，是名词复数，这里是在陈述事实，用一般现在时即可，
谓语动词不需要做任何变化，故填动词“产生”produce。
10．These oranges are too s_________. I don’t want to eat them any more.
【答案】(s)our
【详解】
句意：这些橘子太酸了，我不想再吃它们了。这里是缺少be动词后的形容词作表语，表示“酸的”，故填
(s)our。
四、选词填空
while; tradition; compare with; divide into; correct;
look forward to; cry; be proud of; breath; pollute
1．Sports build our body ________ reading builds our mind.
2．He has trouble ________ because of sickness.
3．We are sad about the ________ of our environment.
4．The boy was excited because he answered the question ________.
5．Chinese ________ medicine should be developed all over the world.
6．________ his house, mine is larger and cheaper.
7．Sometimes, all of the students ________ four groups by the teachers while having a discussion.
8．It’s no use ________ over spilt milk.
9．Liu Xiang did very well in the Olympic Games. We ________ him.
10．We ________ seeing you again.
【答案】
1．while2．breathing
3．pollution
4．correctly
5．traditional
6．Compared with
7．were divided into
8．crying
9．are proud of
10．look forward to
【分析】
1．句意：体育锻炼身体，阅读锻炼心智。根据句子结构，空格处应填连词，备选单词中 while意为“而”，
符合句意，故填while。
2．句意：他因病呼吸困难。根据句意可知，他因为生病，所以导致呼吸困难。备选单词中breath作动词，
意为“呼吸”，且位于“have trouble in doing sth.”结构中，故breath应用ing形式。故填breathing。
3．句意：我们对环境污染感到难过。根据be sad about和environment可知，此处指的是“为环境污染感到
难过”。备选单词中pollute作动词，其名词形式为pollution，意为“污染”，符合句意及句子结构，故填
pollution。
4．句意：男孩很兴奋，因为他答对了问题。根据上文“The boy was excited”可知，此处指的是“他答对了
问题”。空格处应填副词修饰从句谓语answered，备选单词中correct的副词形式为correctly，意为“正确
地”。故填correctly。
5．句意：中医药应该在全世界范围内发展。根据句中“Chinese medicine”提示，中医属传统医学，故空格
处应填“传统的”形容词作定语。备选单词中 tradition的形容词形式为traditional，意为“传统的”，符合
句意，故填traditional。
6．句意：和他的房子相比，我的房子更大也更便宜。根据下文“mine is larger and cheaper”可知，此处存
在比较，备选单词中compare with意为“与……比较”，且主语与该动词短语之间为动宾关系，故应用过
去分词compared with，且compared位于句首首字母应大写。故填Compared with。
7．句意：有时，所有的学生在讨论时被老师分成四组。根据“all of the students … four groups”可知，学生
们被分为了四组，备选单词中divide into意为“分成”，根据语境可知，此处指的是过去发生的事，且 by
the teachers提示此处应用一般过去时的被动语态，主语为all of the students，故填were divided into。
8．句意：为洒了的牛奶哭泣是没有用的。根据“spilt milk”提示，此处指的是“为了洒了的牛奶哭泣是没
有用的”。备选单词中cry作动词，意为“哭泣”，且位于It is no use doing sth.结构中，故填crying。9．句意：刘翔在奥运会上表现很好。我们为他感到骄傲。根据上文“Liu Xiang did very well in the Olympic
Games”可知，刘翔的表现很好，我们为他感到骄傲。备选单词中be proud of意为“为……感到骄傲”，主
语为We，故be动词应用are。故填are proud of。
10．句意：我们期待着再次见到你。根据句意及空格后seeing可知，此处指的是“期待着再见到你”。备
选单词中look forward to意为“期待、盼望”，后接动词动名词形式 seeing，主语为we，故填look forward
to。
五、句型转换
1．Potato chips were invented by mistake.（对画线部分提问）
________ ________ potato chips ________？
2．John went to bed after he finished his homework.（改为同义句）
John ________ go to bed ________ he finished his homework.
3．They didn't clean the classroom last week.（改为被动语态）
The classroom ________ ________ last week.
4．The hot ice-cream scoop is used for serving really cold ice-cream.（对画线部分提问）
________ ________ the hot ice-cream scoop ________ ________？
5．People believe that the story is true.（改为同义句）
________ ________ ________ that the story is true.
【答案】
1． How were invented
2． didn't until
3． wasn't cleaned
4． What is used for
5． It is believed
【解析】
1．对画线句子提问是变特殊疑问句的一种提问方式，特殊疑问句=特殊疑问词+一般疑问句，在本题中
“by mistakes错误地”，应该用hou来代替，剩下的句子变成一般疑问句。这里将助动词ware提前，谓语
动词不变，故填：How，were，invented。
2．句意：他昨晚直到做完作业后才去睡觉了。
根据句意可知，因为原句是一般过去时，结合词组not...yntil（直到...才）可知，第一个空格要填didn't，第
二个空格要填until，符合要求，故填：didn’t，until。
3．原句句意：他们上周没有打扫教室。被动句句意：上周教室没有被打扫。考查被动语态，由yesterday昨天，可知，用一般过去时态的被动语态。结构是was/were+动词的过去分词，
主语classroom教室，单数，用was，否定形式在was后加not，缩写为wasn't，clean的过去分词是cleaned
打扫，故填：wasn't ，cleaned。
4．本题考查特殊疑问句，由画线部分serving really cold ice-cream，可知讲的是热冰激凌勺的用途，所以疑
问词用what，再把剩余部分变为一般疑问句，直接把is提前，故填：What；is；used；for。
5．考查“it is believed that…”的句型。It是形式主语，真正的主语是that从句，it’s believed that…是指that
引导的从句是被大家公信的，所以用被动语态（be+v.过去分词），从上句believe和is可知时态为一般现
在时，故填：It；is；believed。
六、完成句子
1．许多青少年钦佩像袁隆平那样的科学家，希望成为像他们一样的人。（look）
Many teenagers ________________ the scientists like Yuan Longping and hope to be like them.
【答案】look up to
【详解】
结合所给词“look”可知“钦佩”译为look up to。陈述一般事实，用一般现在时，主语“Many teenagers”是
复数，其后用动词原形。故填look up to。
2．我们不仅要三思而行，而且还要接受别人好的建议。
We should ____________ but also_________________________________.
【答案】not only think twice; accept others’ good advice
【详解】
根据汉语提示可知，本题考查not only…but also…“不但……而且……”。结合英语分析，可知此处缺少
“三思而行和接受别人好的建议”。我们知道“三思而行”也就是“三思，反复考虑”用think twice；
“接受别人好的建议”用accept others’ good advice；要注意名词所有格的复数形式。根据以上分析可知，
答案为(1). not only think twice; (2). accept others’ good advice。
3．从化不仅历史悠久，而且风景优美。
Conghua has ________ ________ a long history, ________ ________ beautiful scenery.
【答案】not only but also
【详解】
根据中英文对比可知，英文句子缺少“不仅……而且……”的表达，其翻译为“not only...but also...”。故填
not；only；but；also。
4．许多年轻人仰慕这些篮球英雄并且想成为像他们一样的人。
Many young people _________ _________ to these basketball heroes and want to become like them.【答案】look up
【详解】
根据中英文对照可知，look up to“敬仰，仰慕”；根据“want”可知，本句是一般现在时，主语是人称复数，
故动词用其原形。故填look；up。
5．把这些学生分成两组是个好主意。
It’s a good idea ________ two groups.
【答案】to divide the students into/to divide these students into
【详解】
把……分成……：divide…into…；这些学生：the/these students。根据句子结构可知，it是形式主语，真正
的主语应用动词不定式；动词不定式的构成为：to do。故填to divide the/these students into。
七、补全对话5选5
A: Hey, Matt. What are you wearing on your wrist(手腕)?
B: It’s a Fitbit. I think it’s a really useful invention.
A: Let me have a look. 1 ．
B: It was invented in 508 and it has become more and more popular since then.
A: 2 ． It looks just like a watch.
B: A Fitbit is not just a watch. 3 ．
A: Really? That’s interesting.
B: Yes. It gives me helpful information. For example, it can count my steps and tell me if I exercise enough.
A: Cool! 4 ．
B: It gives information about my sleep.
A: That’s helpful! 5 ．
B: I don’t know. My mom gave it to me as my birthday gift.
A: Lucky you!
A．It can tell me about my health.
B．It must be very expensive.C．When was it invented?
D．What else can a Fitbit do?
E. What is it used for?
【答案】
1．C
2．E
3．A
4．D
5．B
【分析】
本文是A与Matt讨论Fitbit智能手环的一则对话。
1．根据“It was invented in 508”可知，此处询问它是什么时候发明的，C选项“它是什么时候发明的”符
合语境，故选C。
2．根据“A Fitbit is not just a watch”可知，此处应询问这个东西是用来干什么的，E选项“它是作什么用
的”符合语境，故选E。
3．根据“A Fitbit is not just a watch”可推断，此处应介绍它的用处，A选项“它可以告诉我关于我的健康”
符合语境，故选A。
4．根据“It gives information about my sleep”可知，此处应询问它可以做什么事情，D选项“Fitbit还能做
什么”符合，故选D。
5．根据“I don’t know. My mom gave it to me as my birthday gift”及结合选项，可知，此处应推测它价格比
较昂贵，B选项“那一定很贵”符合语境，故选B。
八、阅读单选
Can a green machine help the world’s poorest kids learn better? Nicholas Negroponte thinks so. He and his
team of scientists have invented a new type of computer. As a result, many children who live in poverty (贫穷) will
have their own laptop computers!
Negroponte works at a university. He started a group called One Laptop Per Child (OLPC). The people atOLPC don’t work for money. They work to help children learn. OLPC makes computers that don’t cost a lot. Then
they sell the machines to governments of countries that have many people live in poverty. The governments then
give the computes to kids for free.
The XO Laptop computers are made for school-aged children in developing nations. Many of these children
live in faraway areas and go to schools with classrooms. In order to work, the laptops have to be lasting and
student-friendly.
The machines have many fun characters like a built-in video camera, voice recording, and games. The WiFi
lets students share information on the Web and read e-books. They also can make music and chat with friends.
Another great character is that it can last for a long time. It can be hand charged and also can be recharged by
connecting to a solar panel. Because of these characters the XO laptops make learning fun while helping the
environment.
The computers have a colorful name—“the green machine”. Negroponte thinks they could make a difference
in the lives of millions of kids. He says, “Every problem you can think of—poverty, peace, the environment—is
solved with education.”
OLPC plans to give out over ten million computers in the next few years. Kids in Thailand, Nigeria, Brazil,
and Argentina will get most of them. China and Egypt also want to take part in the program. After that, Negroponte
hopes to sell computers to other countries with high poverty.
1．Negroponte thinks his laptop computers will help the world’s poorest kids to ________.
A．work at home B．go to school on time C．learn better
2．What can we know about the people at OLPC according to Paragraph 2?
A．They work for money.
B．They give computers to kids for free.
C．They sell computers to governments with many people living in poverty.
3．Why do XO laptops make learning fun while helping the environment?
A．Because they are lasting and student-friendly.
B．Because they are made for school-aged children.
C．Because they have a colorful name.
4．What does the underlined word “charged” mean in Chinese?
A．携带 B．充电 C．使用
5．Who will get most of the computers in the next few years?
A．Kids in Thailand. B．Kids in China. C．Kids in Egypt.【答案】
1．C
2．C
3．A
4．B
5．A
【分析】
本文是一篇说明文。主要介绍了Negroponte和他的科学团队发明了一种新型电脑，这个绿色机器能帮助世
界上贫穷的孩子更好地学习。
1．细节理解题。根据“Can a green machine help the world’s poorest kids learn better? Nicholas Negroponte
thinks so. He and his team of scientists have invented a new type of computer.”可知，Negroponte认为他的电脑
可以帮助最穷困的孩子更好的学习。故选C。
2．细节理解题。根据第二段“ OLPC makes computers that don’t cost a lot. Then they sell the machines to
governments of countries that have many people live in poverty. The governments then give the computes to kids
for free.”可知，他们把这些电脑卖给那些有很多人生活在贫困中的国家的政府。然后政府将这些计算机免
费提供给孩子们。故选C。
3．细节理解题。根据“The machines have many fun characters like a built-in video camera...They also can
make music and chat with friends.”和“Another great character is that it can last for a long time ”可知，因为这种
机器持续时间长，而且可以供学生娱乐，所以有趣。故选A。
4．词义猜测题。根据“...also can be recharged by connecting to a solar panel”可知，此处的“charged”指的是
充电，故选B。
5．细节理解题。根据“OLPC plans to give out over ten million computers in the next few years. Kids in
Thailand, Nigeria, Brazil, and Argentina will get most of them. ”可知，泰国、尼日利亚、巴西和阿根廷的孩子
将获得其中大部分，故选A。
