/ 让教学更有效 英语学科
Unit 1 How can we become good learners？语法讲练
【知识导图】
【要点拓展】
“by+时间点”的动词时态：
(1)后接过去的时间，多与过去完成时连用。
例：They had finished their work by the end of last week.到上周末他们已经完成了工作。
(2)后接now时，多与现在完成时连用。
例：Maybe she has returned by now．或许现在她已经回来了。
(3)后接将来的时间，多与一般将来时或将来完成时连用。
例：I’ll be there by five o’clock this afternoon.我今天下午五点以前到那里。
2．介词by的其他用法：
(1)表示原因（名词前不加冠词），如by chance、by mistake、by accident、by luck、by reason of、by design。
例：They met by chance.他们不期而遇。
I did it by mistake.我误做了这件事。
(2)表示通过某种方式（名词前不加冠词），如by phone、by hand、by machine、by radio...
(3)身体部位名词／衣服名词”表示“被抓住身体／衣物的某一部分”，常与动词catch／seize／hold／grab等连用（名词前需加冠词）。
例：The policeman caught the thief by the arm.警察抓住了小偷的胳膊。
I took him by the hand.我拉着他的手。
(4)用于乘除运算
例：6 multiplied by 3 equals 18. 6乘以3等于18。
6 divided by 3 equals 2. 6除以3等于2。
3．by构成的介词短语作方式状语时，对其提问应用疑问词How。
例：-How do you study for a test？-你是如何准备考试的？
-By working hard.-通过努力学习。
【奇思巧计】
【同步检测】
一、单项选择
1. --How do you study _____a test --I study _____ working with a group.
A. by; in B.for; by C. for;from D. for; with
2. --Michael, could you tell me how we can pass the final examination
--______practicing again and again.
A. For B. By C. With
3. I improved my spoken English_______watching English movies and listening to English songs.
A. in B. to C. for D. by
4. --I have no cash on hand, may I pay _________WeChat --Of course.
A. by B. with C.off D.in
5. He sent the news to me ______e-mail last week.
A. on B. at C. with D. by
6. Jack improves his English by _______in the morning.
A. take notes B.practice more C.reading aloud D. watch videos
7. Some students are singing and dancing under the big tree, and some are drawing _____the lake.
A. in B. by C. on D. over
8. I like rainy days. I usually read books _______the window when it rains.
A. by B. in C. on D. to
9. More and more people in our city go to work ____bus.
A. in B. by C. with D. for
10._____the end of June, 2019, China’s civil aviation(民航) industry had realized 106 months of continuous safe flight operations.
A. On B. At C. In D. By
11. Simon is not allowed to go out in the evening unless he promises to be home_____10 o'clock at the latest.
A. since B. by C. after D. till
12. Can you arrive at the gate of the park ____noon
A. in B. by C. for D. behind
13. Few students could understand the sentence until it ______by Miss Chen.
A. explained B. was explained C. was explaining D. have explained
14. --People, especially the young, ______by their friends.
--That's right. Friends play an important role in everyone's life.
A. easily influence B. is easily influenced C. are easily influenced
15. Success in life doesn't happen ______. It depends on our hard work.
A. by ourselves B. by the way C. by accident D. by air
16.- You skate so well. Who taught you I learned it by _____.
A. me B. mine C. myself
17. In the past, people washed clothes _______.
A. by hand B. with hand C. by hands
18. Jeff goes to work _____and his wife goes to work ______.
A. by car; on bike B. by a car; on a bike
C. by car; on her bike D. by his car; in his bike
二、用所给单词的正确形式填空
1. I can do it by ______(I).
2. We go to Beijing by_______(bus).
3. This work is finished by______(hand).
4. I think you can improve your English by________(watch) English movies.
5. Water is changed into steam by _______(hot) and into ice by cold
[真题链接]
1.(2022·辽宁盘锦·统考中考真题)Vincent sometimes sits ______the river and listens to music.
A. on B.by C. over D. under
2.(2021·贵州贵阳·统考中考真题)In order to protect the environment, many people choose to go to work ____ subway.
A.in B. on C. by
3.(2019·湖北·统考中考真题)--I never see Linda take a taxi to work.
--To live a low-carbon life, she always goes to work _____her bike instead of____taxi.
A. by;by B. on;by C. on;in
4.(2019·安徽·中考真题)On sunny days, my grandma often reads a novel ____ the window.
A. by B. for C. with D. from
5.(2018·黑龙江鹤岗·中考真题)_____convenient the way is! We can pay money_____ scanning QR codes(二维码)in many shops.
A. How;for B. How; by C. What; by
6.(2018·广西河池·统考中考真题)You can improve your English_____listening to English songs.
A. by B. with C.for D. in
7.(2018·山东青岛·中考真题)More and more people in Qingdao go to work ______subway now.
A. with B. on C.in D. by
8.(2020·黑龙江绥化·统考中考真题)By the time the teacher came, we _________cleaning the classroom.
A. finished B. have finished C. had finished
9.(2019·上海·中考真题)By the end of last month, Jane_____enough money for the poor sick boy.
A. raised B. would raise C. had raised D. has raised
10.(2023·江苏徐州·中考真题)The Monkey King is a traditional Chinese character. It ______by people of all ages.
A. is loved B. was loved C. will love D. is loving
11.(2023·湖南怀化·统考中考真题)The cake_____by the hungry students quickly yesterday.
A. eats B. is eaten C.was eaten
12.(2022·辽宁朝阳·统考中考真题)It’s said that tea______by accident about five thousand years ago.
A. was invented B. is invented C. will be invented D. were invented
13.(2022·北京·统考中考真题)On our farm, the tea leaves ______by hand when they are ready.
A. pick B. picked C. are picked D. were picked
14.(2022·海南·统考中考真题)Few students could understand the sentence until it _____ by Miss Chen.
A. explained B. was explained C. was explaining
15.(2022·江苏扬州·统考中考真题)-I hear that you took part in a forest clean-up activity last Sunday.
Yes, it_______by our school green club to protect forests.
A. organizes B. organized C.was organized D. will be organized
16.(2022·湖南株洲·统考中考真题)Mary is a book lover. She could read by _____at the age of five.
A. herself B. himself C. themselves
17.(2022·福建·统考中考真题)As the art festival is coming, they are preparing everything by_____.
A. yourselves B. ourselves C. themselves
18.(2021·贵州毕节·统考中考真题)My grandma can use WeChat(微信).She learns it all by______.
A. she B. herself C. her D. hers
19.(2022·黑龙江·统考中考真题)I'll go to senior high school soon. I can't believe how fast the time_____!
A. went on B. went off C. went by
20.(2022·四川自贡·统考中考真题)--How can we save electricity in daily life By _____the lights when we leave a room, for example.
A.turning off B.putting off C. taking off
21.(2019·四川宜宾·中考真题)Oh, _______, if you see Lucy, tell her that I enjoy her Chinese paintings.
A. in fact B. by the way C.in other words
21世纪教育网(www.21cnjy.com)(共52张PPT)
Unit 1 How can we become good learners？
九年级
人教版
全
语法讲练及解析
【知识导图】
【要点拓展】
“by+时间点”的动词时态：
(1)后接过去的时间，多与过去完成时连用。
例：They had finished their work by the end of last week.到上周末他们已经完成了工作。
(2)后接now时，多与现在完成时连用。
例：Maybe she has returned by now．或许现在她已经回来了。
(3)后接将来的时间，多与一般将来时或将来完成时连用。
例：I’ll be there by five o’clock this afternoon.我今天下午五点以前到那里。
2．介词by的其他用法：
(1)表示原因（名词前不加冠词），如by chance、by mistake、by accident、by luck、by reason of、by design。
例：They met by chance.他们不期而遇。
I did it by mistake.我误做了这件事。
(2)表示通过某种方式（名词前不加冠词），如by phone、by hand、by machine、by radio...
(3)身体部位名词／衣服名词”表示“被抓住身体／衣物的某一部分”，常与动词catch／seize／hold／grab等连用（名词前需加冠词）。
例：The policeman caught the thief by the arm.警察抓住了小偷的胳膊。
I took him by the hand.我拉着他的手。
(4)用于乘除运算
例：6 multiplied by 3 equals 18. 6乘以3等于18。
6 divided by 3 equals 2. 6除以3等于2。
3．by构成的介词短语作方式状语时，对其提问应用疑问词How。
例：-How do you study for a test？-你是如何准备考试的？
-By working hard.-通过努力学习。
【奇思巧计】
【同步检测】
一、单项选择
1. --How do you study _____a test --I study _____ working with a group.
A. by; in B.for; by C. for;from D. for; with
[答案]B
[详解]句意:--你是如何为考试而学习的 --我和一个小组一起学习。
考查介词辨析。by 通过，表方式、方法或手段;in在......里面;for为了，表示动作的目的原因等;from 从;with 和。根据问句“How do you study...a test ”可知，第一个空表示你如何为考试而学习，表目的，用介词 for;根据答句“I study...working with a group."，此处表方式，我通过小组活动来学习，第二个空用介词by。故选B。
2. --Michael, could you tell me how we can pass the final examination
--______practicing again and again.
A. For B. By C. With
[答案]B
[详解]句意:--迈克尔，你能告诉我我们怎样才能通过期末考试吗 --通过一次又一次的练习。
考查介词辨析。For为了: By 通过:With 和。根据“how we can pass the final examination”可知，询问的是通过期末考试的方法，因此此处应用表示手段的介词by。故选B。
3. I improved my spoken English_______watching English movies and listening to English songs.
A. in B. to C. for D. by
[答案]D
[详解]句意:我通过看英语电影和听英语歌曲提高了我的英语口语。
考查介词词义辨析。in 在......里面;to到; for 为了: by通过。根据“watching English movies and listening to English songs”可知，题干使用了by doing sth.短语结构，意思是“通过做某事”，作方式状语。故选 D。
4. --I have no cash on hand, may I pay _________WeChat --Of course.
A. by B. with C.off D.in
[答案]A
[详解]句意:--我身上没带现金，可以用微信支付吗 --当然。
考查介词辨析。by 通过，表方式:with 和;off离开;in在...…里面。根据语境可知，pay by表示“用....…方式付款”，介词by“通过”，表方式，符合语境。故选A。
5. He sent the news to me ______e-mail last week.
A. on B. at C. with D. by
[答案]D
[详解]句意:上个星期他通过电子邮件给我发的这个消息。
考查介词辨析。on 关于;at 在:with 和:by通过。根据“He sent the news to me"和“e-mail”可知他发消息的方式是电子邮件，故选D。
6. Jack improves his English by _______in the morning.
A. take notes B.practice more C.reading aloud D. watch videos
[答案]C
[详解]句意:杰克通过在早上大声阅读去提升他的英语。
考查动词短语辨析及by 的用法。take notes 记笔记:practice more多练习:reading aloud 大声阅读:watch videos 看视频。by 为介词，后面要用动名词形式。故选C.
7. Some students are singing and dancing under the big tree, and some are drawing _____the lake.
A. in B. by C. on D. over
[答案]B
[详解]句意:一些学生在大树下唱歌和跳舞，一些在湖边画画。
考查介词辨析。in在......里面;by在......旁边;on 在上面;over 在......正上方。根据“and some are drawing...the lake.”可知是在湖边画画。故选 B。
8. I like rainy days. I usually read books _______the window when it rains.
A. by B. in C. on D. to
[答案]A
[详解]句意:我喜欢雨天。下雨时我通常在窗边看书。
考查介词辨析。by在......旁边;in在......内;on 在......之上:to 朝。结合语境可知下雨时，说话人喜欢在窗户旁边看书，所以这里用表示地点的介词by。故选A。
9. More and more people in our city go to work ____bus.
A. in B. by C. with D. for
[答案]B
[详解]句意:在我们城市里，越来越多的人乘公共汽车去上班。
考查介词。in在......里面;by通过:with有;for为了。根据“bus”可知，此处指的是“乘坐公共汽车”，用短语by bus，故选B。
10._____the end of June, 2019, China’s civil aviation(民航) industry had realized 106 months of continuous safe flight operations.
A. On B. At C. In D. By
[答案]D
[详解]句意:到2019年6月底，中国民航实现持续安全飞行106个月。
考查介词辨析。on后接具体一天;at后接具体时刻;in后接某年某月某:by到......为止。根据“the end of June”以及“had realized”可知，by the end of+过去的时间，与过去完成时搭配，故选 D。
11. Simon is not allowed to go out in the evening unless he promises to be home_____10 o'clock at the latest.
A. since B. by C. after D. till
[答案]B
[详解]句意:西蒙晚上不准外出，除非他答应最迟10点钟之前到家。
考查介词辨析。since自......之后;by到.…...之前;after在......之后;till 直到。根据“he promises to be home...10 o'clock at the latest.”可知，西蒙被允许外出的条件是最迟10点之前回来。故选B。
12. Can you arrive at the gate of the park ____noon
A. in B. by C. for D. behind
[答案]B
[详解]句意:你能在中午之前到达公园门口吗
考查介词辨析。in 在......里; by在......之前;for为了;behind在......后面。短语 by noon表示“在中午前”，符合题意。故选B。
13. Few students could understand the sentence until it ______by Miss Chen.
A. explained B. was explained C. was explaining D. have explained
[答案]B
[详解]句意:很少有学生能理解这个句子，直到陈老师解释了它。
考查一般过去时的被动语态。根据“Few students could understand the sentence”可知句子时态为一般过去时，而主语it和谓语explain为逻辑上的动宾关系，应用被动语态，一般过去时的被动语态的谓语结构为“was/were+done”，故选B。
14. --People, especially the young, ______by their friends.
--That's right. Friends play an important role in everyone's life.
A. easily influence B. is easily influenced C. are easily influenced
[答案]C
[详解]句意:--人们，尤其是年轻人，很容易受到朋友的影响。--没错。朋友在每个人的生活中都扮演着重要的角色。
考查被动语态。分析句意可知，主语是动作的承受者，应用被动语态，构成为:be+动词过去分词:时态是一般现在时，主语“people”为集合名词，be动词用are。故选C。
15. Success in life doesn't happen ______. It depends on our hard work.
A. by ourselves B. by the way C. by accident D. by air
[答案]C
[详解]句意:人生的成功并非偶然。这取决于我们的努力。
考查介词短语辨析。by ourselves 独自:by the way 顺便一提:by accident偶然地;byair 乘飞机。由“Success in life doesn't happen .... It depends on our hard work”可知，此处说的是成功并非偶然。故选C。
16.- You skate so well. Who taught you I learned it by _____.
A. me B. mine C. myself
[答案]C
[详解]句意:你划得真好。谁教的你 --我自学的。
考查介词和介词短语。me我:mine我的(东西):myself我自己;by oneself“靠自己”，故选C.
17. In the past, people washed clothes _______.
A. by hand B. with hand C. by hands
[答案]A
[详解]句意:过去，人们用手洗衣服。
考查介词短语。根据句意可知，此处表示过去人们用手洗衣服，by hand 意为“用手”，为固定搭配。故选 A。
18. Jeff goes to work _____and his wife goes to work ______.
A. by car; on bike B. by a car; on a bike
C. by car; on her bike D. by his car; in his bike
[答案]C
[详解]句意:杰夫开车去上班，他的妻子骑自行车去上班。
考查介词短语。by car“乘坐汽车”，排除B、D两项;on a/one’s bike“骑自行车”，排除A项。故选C
二、用所给单词的正确形式填空
1. I can do it by ______(I).
[答案]myself
【详解]句意:我可以自己做它。I是人称代词，意为“我”，by oneself 意为“独自，某人自己”;主语是I，反身代词人称与I一致，故填 myself。
2. We go to Beijing by_______(bus).
[答案]bus
[详解]句意:我们乘公交车去北京。by表示通过某种方式，“乘公交车”by bus，中间不加任何冠词。故填bus。
3. This work is finished by______(hand).
[答案]hand
[详解]句意:这项工作是手工完成的。根据空前by可知，用by hand 手工。故填 hand。
4. I think you can improve your English by________(watch) English movies.
[答案]watching
[详解]句意:我认为你可以通过看英语电影来提高你的英语水平。by 是介词，后可接动名词形式作宾语，by doing意为“通过某种方式”;watch 是动词，意为“观看”。故填 watching.
5. Water is changed into steam by _______(hot) and into ice by cold.
[答案]heat
[详解]句意:水可以被加热变成蒸汽，可以被冻成冰。介词by意为“通过”，这里是想表达“通过热量”，故填形容词hot“热的”的名词形式“热量”heat。故填 heat。
[真题链接]
1.(2022·辽宁盘锦·统考中考真题)Vincent sometimes sits ______the river and listens to music.
A. on B.by C. over D. under
[答案]B
[详解]句意:Vincent有时坐在河边，听音乐。
考查介词辨析。on 在......上面; by 在......旁边;over在......上方;under在......下面。sit by the river 表示“坐在河边”，因此空格处应用介词by。故选B。
2.(2021·贵州贵阳·统考中考真题)In order to protect the environment, many people choose to go to work ____ subway.
A.in B. on C. by
[答案]C
[详解]句意:为了保护环境，许多人选择乘地铁上班。
考查介词用法。in在...…里面; on在......上面;by后接交通工具，表示乘坐....。根据句子结构可知，这里考查交通方式:“by+交通工具”或“in/on+冠词+交通工具”，介词短语:根据“subway”前面没有冠词和形容词性物主代词，可知此处为介词短语by subway“坐地铁”。故选C。
3.(2019·湖北·统考中考真题)--I never see Linda take a taxi to work.
--To live a low-carbon life, she always goes to work _____her bike instead of____taxi.
A. by;by B. on;by C. on;in
[答案]B
[详解]句意:--我从来没见琳达坐出租车上班。-为了低碳生活，她总是骑自行车上班，而不是乘出租车。
by 乘,“by +交通工具”表示乘坐...….;on 在......之上,on one's bike表示骑自行车;in在......里面，in one's car表示坐小汽车。分析句子，第一个空格应用on，故排除A:第二个空格应用 by.故选 B。
4.(2019·安徽·中考真题)On sunny days, my grandma often reads a novel ____ the window.
A. by B. for C. with D. from
[答案]A
[详解]句意:在晴朗的日子里，我的奶奶经常在窗户旁边读小说。by在...旁边;通过...方式:for为了，因为:with 和...一起:用;from 来自...，从...。根据句意可知，这里考查短语by the window在窗户旁边，故应选A。
5.(2018·黑龙江鹤岗·中考真题)_____convenient the way is! We can pay money_____ scanning QR codes(二维码)in many shops.
A. How;for B. How; by C. What; by
[答案]B
[详解]句意:这种方式多方便啊!我们可以在许多商店扫描二维码来付钱。根据convenient the way is!可知这里考查了感叹句，本句的中心词是convenient，它是一个形容词，根据 How+形容词/副词+主语+谓语!这里用how引导这个感叹句,而We can pay money_scanning QR codes(二维码)in many shops这里表示通过某种方式用介词by。故选B.
6.(2018·广西河池·统考中考真题)You can improve your English_____listening to English songs.
A. by B. with C.for D. in
[答案]A
【详解]句意:你可以通过听英文歌曲来提高英语水平。考查介词。A.by 通过,乘坐;B.with和，用，拥有;C.for 为了，给;D.in 在...里。短语 by doing sth.:通过某种方式做某事， by 是介词，用来表示方法、手段、方式，意思是“凭借;靠:用;通过”，后接动词-ing形式。结合句意可知选A。
7.(2018·山东青岛·中考真题)More and more people in Qingdao go to work ______subway now.
A. with B. on C.in D. by
[答案]D
【详解]句意:现在越来越多的青岛人乘地铁去上班。A.with 用; B.on 在-上:C. in 在--里: D.by乘;根据on/in+the+交通工具，by+交通工具;故选D
8.(2020·黑龙江绥化·统考中考真题)By the time the teacher came, we _________cleaning the classroom.
A. finished B. have finished C. had finished
[答案]C
[详解]句意:老师来的时候，我们已经打扫完了教室。
考查过去完成时。A.finished 表一般过去时;B.have finished表现在完成时:C.had finished表过去完成时。根据英语语法，by the time引导时间状语从句，从句为一般过去时，主句应用过去完成时，表示截止到从句动作发生时，主句动作已经完成，即过去的过去。故选C。
9.(2019·上海·中考真题)By the end of last month, Jane_____enough money for the poor sick boy.
A. raised B. would raise C. had raised D. has raised
[答案]C
[详解]句意:到上个月底，简已经为那个可怜的生病男孩筹到了足够的钱。
A.raised 筹钱;B.would raise会筹钱;C.had raised 已经筹钱;过去完成时:D.has raised已经筹钱，现在完成时。根据时间状语By the end of last month可知用过去完成时，其结构是had done 的形式。根据题意，故选C。
10.(2023·江苏徐州·中考真题)The Monkey King is a traditional Chinese character. It ______by people of all ages.
A. is loved B. was loved C. will love D. is loving
[答案]A
[详解]句意:孙悟空是中国的一个传统人物。它受到所有年龄段的人的喜爱。
考查被动语态及动词时态。根据“by”可知，此处是被动语态，指孙悟空被人们喜爱。本句陈述事实，故为一般现在时。故选A。
11.(2023·湖南怀化·统考中考真题)The cake_____by the hungry students quickly yesterday.
A. eats B. is eaten C.was eaten
[答案]C
[详解]句意:昨天，那个蛋糕被饥饿的学生们很快吃完了。
考查一般过去时的被动语态。根据“yesterday”可知句子应用一般过去时，主语The cake与动词 eat 存在逻辑上的被动关系，因此句子应用一般过去时的被动语态，其谓语结构为: was/were+过去分词。故选C.
12.(2022·辽宁朝阳·统考中考真题)It’s said that tea______by accident about five thousand years ago.
A. was invented B. is invented C. will be invented D. were invented
[答案]A
[详解]句意:据说茶是大约5000年前偶然发明的。
考查被动语态。分析句子可知tea 和invent之间是被动关系，根据“five thousand years ago.’可知句子应用一般过去时的被动语态:was/were+done，且tea是不可数名词，be动词应用 was，故选 A。
13.(2022·北京·统考中考真题)On our farm, the tea leaves ______by hand when they are ready.
A. pick B. picked C. are picked D. were picked
[答案]C
[详解]句意:在我们的农场，茶叶成熟时都是手工采摘的。
考查一般现在时的被动语态。主语“the tea leaves”是动作“pick”的承受者，时态是一般现在时，所以用一般现在时的被动语态。故选C。
14.(2022·海南·统考中考真题)Few students could understand the sentence until it _____ by Miss Chen.
A. explained B. was explained C. was explaining
[答案]B
[详解]句意:在陈老师解释之前，有很少学生能理解这个句子。
考查动词时态和语态。根据“could understand”可知句子时态是一般过去时，分析句子主语it和动词 explain可知，它们是被动关系，应用一般过去时的被动语态，故选B。
15.(2022·江苏扬州·统考中考真题)-I hear that you took part in a forest clean-up activity last Sunday.
Yes, it_______by our school green club to protect forests.
A. organizes B. organized C.was organized D. will be organized
[答案]C
[详解]句意:--我听说你上周日参加了森林清理活动。一是的。我们学校的环保俱乐部组织了这次活动来保护森林。
考查动词的时态和语态。根据“last Sunday”可知是过去的事，是一般过去时。主语“it”指的是“a forest clean-up activity”，和动词之间是被动关系，表达“被组织”用一般过去时的被动结构“was organized”。故选 C。
16.(2022·湖南株洲·统考中考真题)Mary is a book lover. She could read by _____at the age of five.
A. herself B. himself C. themselves
[答案]A
[详解]句意:玛丽是个爱读书的人。她五岁时就能自己读书了。
考查反身代词。herself她自己;himself他自己;themselves 他们自己。根据 she 可知，此空应填反身代词herself,故选A。
17.(2022·福建·统考中考真题)As the art festival is coming, they are preparing everything by_____.
A. yourselves B. ourselves C. themselves
[答案]C
[详解]句意:随着艺术节的到来，他们正在自己准备一切。
考查反身代词。yourselves你们自己:ourselves 我们自己;themselves 他们自己。根据“they”可知主语是第三人称，反身代词应用themselves。故选C。
18.(2021·贵州毕节·统考中考真题)My grandma can use WeChat(微信).She learns it all by______.
A. she B. herself C. her D. hers
[答案]B
[详解]句意:我奶奶会用微信。她全是自学的。
考查反身代词。she 她，人称代词主格:herself她自己，反身代词;her她，人称代词宾格/她的，形容词性物主代词;hers她的，名词性物主代词。by oneself独自，用反身代词，故选B。
19.(2022·黑龙江·统考中考真题)I'll go to senior high school soon. I can't believe how fast the time_____!
A. went on B. went off C. went by
[答案]C
[详解]句意:我很快就要上高中了。我不敢相信时间过得这么快!
考查动词短语辨析。went on 继续:went off 离开: went by时间逝去。根据“I can't believe how fast the time”可知，此处指时间过得太快，故选C。
20.(2022·四川自贡·统考中考真题)--How can we save electricity in daily life By _____the lights when we leave a room, for example.
A.turning off B.putting off C. taking off
[答案]A
[详解]句意:日常生活中如何省电 -例如，当我们离开房间时关灯。考查动词短语。turning off 关闭;putting off 推迟;taking off起飞。根据“the lights”可知为了省电，在离开房间时要关灯。故选A。
21.(2019·四川宜宾·中考真题)Oh, _______, if you see Lucy, tell her that I enjoy her Chinese paintings.
A. in fact B. by the way C.in other words
[答案]B
[详解]句意:哦，顺便说一下，如果你看到Lucy，告诉她我非常欣赏她的中国画。
in fact 事实上，实际上;by the way顺便说一下;顺便问一下;in other words换句话说。根据语境可知，这里是顺便提到的事情，故应选B。
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