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Unit 13 I’m trying to save the earth.
第四课时(分层作业)
基础达标
一、多句选词填空
用方框中所给单词的适当形式填空
harm，fisherman，science，wood，buy
1．There’s a ________ boat in the middle of the lake.
2．The pollution is ________ to all the life on the earth.
3．All the ________ are not allowed to catch fish in this area.
4．We found out the truth by doing a lot of ________ experiments.
5．I can’t afford ________ that book because it is too expensive.
【答案】1．wooden 2．harmful 3．fishermen 4．scientific 5．to buy
【解析】1．句意：湖中央有一艘木船。空处修饰其后的名词，结合选词可知，此处应用
wooden“木制的”，故填wooden。
2．句意：污染对地球上所有的生命都有害。根据“The pollution is...to all the life on the
earth”及选词可知，污染是有害的，harmful“有害的”，be harmful to“对……有害”，故填
harmful。
3．句意：所有的渔民都不允许在这个地区捕鱼。根据“are not allowed to catch fish”及选词
可知，此处指的是fisherman“渔民”，空前有all修饰，名词用复数形式，故填fishermen。
4．句意：我们通过做大量的科学实验发现了真相。根据“We found out the truth by doing a
lot of...experiments.”及选词可知，此处指的是“科学的实验”，scientific“科学的”，是形
容词，作定语，修饰其后的名词，故填scientific。
5．句意：我买不起那本书，因为它太贵了。根据“because it is too expensive.”及选词可知，
此处指的是“买不起”，afford to do sth“支付得起去做某事”，故填to buy。
二、按要求完成句子
6．He used to go fishing by the lake every weekend. （对画线部分提问）
________ ________ he ________ to do every weekend?
【答案】 What did use
【详解】句意：他过去每个周末都去湖边钓鱼。根据划线部分“go fishing by the lake”可知，
此处是对动作的提问，应用what，原句是一般过去时，疑问句用助动词did，后接动词原
形，故填What；did；use。
试卷第1页，共3页
学科网（北京）股份有限公司7．I don’t agree that we should cut down too many trees. （改为简单句）
I am ________ cutting down too many trees.
【答案】against
【详解】句意：我不同意我们应该砍伐太多树木。原句是宾语从句，表示“不同意砍树”，
猜测可以转换成“反对砍树”，结合“am...cutting”可知，句子已有谓语，此处可用介词
against“反对”，故填against。
8．Tom doesn’t have enough money to buy that violin. （改为同义句）
Tom ________ ________ ________ buy that violin.
【答案】 can’t afford to
【详解】句意：汤姆没有足够的钱买那把小提琴。“没有足够的钱买”可改为“不能负担
得起”，应用情态动词can’t表示能力“不能”；其后加动词原形afford“负担得起”，
afford to do sth.“负担得起做某事”。故填can’t；afford；to。
9．How much did she pay for the dress?（改为同义句）
How much ________ the dress ________ her?
【答案】 did cost
【详解】句意：她买这条裙子花了多少钱？转换句主语是“the dress”，此处可以用cost表
示“花费”，原句是一般过去时，疑问句用助动词did，后接动词原形，故填did；cost。
10．She is not a music lover anymore. （改为同义句）
She is ________ ________ a music lover.
【答案】 no longer##more
【详解】句意：她不再是音乐爱好者了。not...anymore表示不再……，可用no more/no
longer替换，表示“不再”，是固定短语，故填no；longer/more。
能力提升
二、单项选择
11．—This is really _______ ugly bird.
—But it is _______ useful bird. It can help fishermen catch fish.
A．an; a B．an; an
C．a; a D．a; an
【答案】A
【详解】句意：——这真是只丑鸟。——但它是一只有用的鸟，它可以帮助渔民捕鱼。
考查冠词的用法。an用于发音以元音音素开头的词前，a用于发音以辅音音素开头的词前。
ugly首字母u发音是元音，所以前面使用an，而useful首字母u发音是辅音，所以前面使
用a。故选A。
12．If you can speak English well, you will have a great ________ over others when looking for a
job.
试卷第2页，共3页A．activity B．advantage C．attention D．action
【答案】B
【详解】句意：如果你能说一口流利的英语，你在找工作时会比别人有很大的优势。
考查名词辨析。activity活动；advantage优点，优势；attention注意；action行动；根据“If
you can speak English well...when looking for a job.”可知，这里是说一个优势，故选B。
13．Throwing rubbish into the river is ________ to the fish in it.
A．useful B．beautiful C．harmful D．meaningful
【答案】C
【详解】句意：把垃圾扔进河里对河里的鱼是有害的。
考查形容词的辨析。useful有用的；beautiful漂亮的；harmful有害的；meaningful有意义的。
根据“Throwing rubbish into the river is…to the fish in it.”以及结合选项可知，把垃圾扔进河
里对鱼有害。“有害的”harmful，是形容词，位于系动词“is”之后，作表语。故选C。
14．—Mr. Huang, it’s late. Why are you still here?
—My daughter hasn’t come back from school yet. I am ________ for her.
A．calling B．waiting C．asking D．hoping
【答案】B
【详解】句意：——黄先生，很晚了。你怎么还在这儿？ ——我女儿还没从学校回来。我
在等她。
考查动词的辨析。calling打电话；waiting等待；asking询问；hoping希望。根据“My
daughter hasn’t come back from school yet. I am…for her.”可知，女儿还没从学校回来，此时
应是爸爸在等女儿。wait for sb“等待某人”。故选B。
15．This book is the most ________ that I have ever read. I can’t put it down.
A．boring B．difficult C．fantastic D．dangerous
【答案】C
【详解】句意：这本书是我读过的最奇妙的书。我放不下它。
考查形容词辨析。boring无聊的；difficult困难的；fantastic极好的；dangerous危险的。根
据“I can’t put it down”可知，书太精彩了，所以无法放下这本书，故选C。
16．Don’t throw away the waste paper. It needs ________.
A．taking B．recycling C．keeping D．remaining
【答案】B
【详解】句意：不要把废纸扔掉。它需要被回收。
考查动词辨析。taking拿；recycling回收；keeping保持；remaining遗留；分析“Don’t
throw away the waste paper. It needs…”可知，废纸可以“被回收”，故选B。
17．Now many wild animals are in danger. If we don’t ________ to protect them, it will be hard
for us to see them in the near future.
A．leave out B．call up C．take action D．give up
【答案】C
试卷第3页，共3页
学科网（北京）股份有限公司【详解】句意：现在许多野生动物处于危险之中。如果我们不采取行动保护它们，我们将
很难在不久的将来看到它们。
考查动词短语。leave out遗漏；call up打电话给；take action采取行动；give up放弃；根据
“Now many wild animals are in danger...it will be hard for us to see them in the near future.”可
知，应是说要“采取行动”保护动物，故选C。
18．—We are supposed to recycle paper and bottles.It can help protect the environment.
—________.It can save money，too.
A．It's nothing B．Best wishes
C．I agree D．All right
【答案】C
【详解】句意：——我们应该重复利用纸和瓶子。它能帮助保护环境。——我同意。它也
能节约钱。It’s nothing.没什么；Best wishes最好的祝福；I agree我同意；All right好，可以。
根据It can save money，too.可知此处同意重复利用纸和瓶子有好处，故选C。
19．We find ________ hard to do a job very well.
A．this B．that C．it D．these
【答案】C
【详解】句意：我们认为做好一份工作很难。根据句型find it +形容词+to do sth认为做某
事是…...，故用代词it，故选C。
20．—What should I do to be a green man?
—It is easy.For example，________ your own bags when ________.
A．take；shopping
B．taking；shopping
C．taking；you shopping
D．take；you shopping
【答案】A
【详解】句意：——要成为一个环保的人，我应该怎么做？——这是容易的。例如，当你
购物时，带着你自己的包。此处是祈使句，故用动词原形作谓语，故第一空为take。第二
空是省略句，主语you和谓语are省略掉，主语you与谓语shop之间是主动关系，故用现
在分词shopping。故选A。
21．—Why haven’t you bought a car, Mr Lin? You can one.
—Well, I have money for it, but I want to go green.
A．offer B．afford
C．avoid D．allow
【答案】B
【详解】试题分析：考查动词辨析。offer提供; afford买得起; avoid避免; allow允许。句意
为“你能买得起”。故选B。
试卷第4页，共3页22．—Now people have to pay some money for bags in supermarkets.
—Yes. Because they are bad for the environment.
A．bin B．paper
C．cloth D．plastic
【答案】D
【详解】试题分析：考查名词辨析。bin垃圾箱; paper纸; cloth布; plastic塑料。句意: 现在
人们必须为超市里的塑料袋付费。故选D。
23．We should try our best to solve pollution problems ________ complaining them.
A．rather than B．instead of C．for D．or
【答案】B
【详解】句意：我们应该尽最大努力解决污染问题，而不是抱怨它们。
考查介词和介词短语辨析。rather than而不是；instead of而不是；for为了；or或者。根据
句意和空后“complaining them”可知，此处表示不应抱怨污染问题，rather than后接动词原
形，故排除A，instead of后接动名词。故选B。
24．—Everyone should use both sides of paper.
—Yes. If we all use both sides of paper, many trees ________ be saved.
A．need B．have to C．can D．must
【答案】C
【详解】句意：——每个人应该使用纸的两面。——是的。如果我们都使用纸的两面，许
多树能被挽救。
考查情态动词辨析。need需要；have to 不得不；can能够；must 是必须。根据句意
“many trees ________ be saved”可知，此处表示能够挽救很多树，应用情态动词can。故选
C。
25．—Don’t keep the water running while brushing your teeth.
—Sorry. I forgot to ________.
A．turn on it B．turn it on C．turn off it D．turn it off
【答案】D
【详解】句意：——刷牙的时候，不要让水一直流淌着。——对不起。我忘了关上它。
考查动词词组辨析。turn on打开；turn off关闭。根据“Don’t keep the water running while
brushing your teeth.”可知，此处表示忘了关上，故用turn off；turn off为动词+副词构成的词
组，代词作宾语时要用宾格放在中间。故选D。
26．—How shall we go to the airport?
—Let’s take the airport bus. It ______ only 20 minutes and ______ much less than taking a taxi.
A．takes；costs B．spends；spends C．spends；costs D．takes；spends
【答案】A
【详解】句意：--我们将如何去机场?--让我们乘坐机场公交车吧。只需要20分钟，比坐出
租车花费更少。故选A。主语是it，表示花费时间用take，花费金钱用cost；spend的主语
试卷第5页，共3页
学科网（北京）股份有限公司必须是人，故选A。
【点睛】spend主语是人，宾语可以是钱、精力、时间等。cost主语是物或事，后接life，
money，health， time等，侧重于“花费”的代价。take的主语是事或人，它说明事情完成
“花费了…”。
27．—There ________ lots of trees in the area.
—But they have all gone because people built a railway here.
A．have been B．used to be C．have had D．used to have
【答案】B
【详解】句意：——在这个地区过去有很多树。——但是他们都不在了，因为人们在这里
建立一条铁路。
考查一般过去时和there be句型。used to do sth“过去常常做某事”。根据“But they have all
gone because people built a railway here.”可知，空格所在句表示过去这里有很多树，应用一
般过去时，排除A、B选项，根据“There ... lots of trees in the area.”可知，空格所在句为
there be句型，“be”表示存在，译为“有”。故选B。
28．—I think the biggest environmental problem in my country is air pollution.
—________. The air here is much more polluted than in my country.
A．Not really B．Me, too C．Yes, I agree D．It doesn’t matter
【答案】C
【详解】句意：——我认为在我国最大的环境问题是空气污染。——是的，我同意。这的
空气比我国的污染得更严重。
考查情景交际。Not really真的不是；Me, too我也是；Yes, I agree是的，我同意；It doesn’t
matter没关系。根据“The air here is much more polluted than in my country.”可知，我国空气
污染严重，故表示同意对方的说法。故选C。
29．Recycling is good, so don't ______ bottles or newspapers.
A．find out B．hand in C．use up D．throw away
【答案】D
【详解】句意：回收是好的，所以不要扔掉瓶子和报纸。A. find out 查明；B. hand in 上交；
C. use up 用光；D. throw away扔掉。根据Recycling is good可知此处表示要回收利用，不
要乱扔东西，故选D。
30．—Do you often use paper napkins?
—Seldom，________ they are cheap and easy to get.
A．since B．although C．because D．if
【答案】B
【分析】
【详解】句意：——你经常使用纸巾吗？——很少，尽管他们便宜，容易买到。
since 和because表示原因。although尽管。If是如果的意思。结合句意，前后两句之间表
试卷第6页，共3页示让步关系，故用连词although，故选B。
拓展训练
四、完形填空
I am Grace Cortese，and I am 10 years old.I believe I can make a difference in ___31___ the
environment，because my science teacher，Mrs.Esby，tells us that there are many things we can
do to help protect the environment ___32___ we are willing to change our habits.
Every year at my birthday party，I ___33___ charitable donations instead of gifts.When I was
eight，I asked my friends to donate to the Natural Resources Defense Council to save the polar
bears.I ___34___ almost $150.Last year，my friend，Mary，also did that.Imagine how much
money we could raise to save the environment if everyone asked for charitable donations
___35___ their birthdays!
My whole ___36___ is doing things to help protect the earth，too.Our school makes a
carpooling(合伙用车)program to reduce the number of cars on the road，and we have a “Walk to
School” day once a year.___37___ science teacher，Mrs.Esby，has a “Teenie Greenies” club at
lunch and she teaches a class on how to recycle after school.And we ___38___ do beach clean－
up.
If you ___39___ to do something for the environment，look through the website Grades of
Green.It is ___40___ of great ideas for us to reduce，reuse and recycle waste，and it also has a
lot of really interesting facts.
31．A．using B．protecting C．cleaning D．preventing
32．A．even if B．until C．because D．if
33．A．ask for B．look for C．pay for D．send for
34．A．sold B．borrowed C．raised D．rented
35．A．to B．for C．with D．off
36．A．school B．home C．factory D．office
37．A．Her B．His C．Your D．My
38．A．still B．yet C．also D．already
39．A．want B．consider C．enjoy D．refuse
40．A．short B．full C．tired D．fond
【答案】
31．B 32．D 33．A 34．C 35．B 36．A 37．D 38．C 39．A 40．B
【分析】本文讲述了我每年生日为了保护环境，要求慈善捐赠，而不是礼物。我们学校做
了很多事来帮助保护环境。
试卷第7页，共3页
学科网（北京）股份有限公司31．B
考查动词及语境的理解。A. using 使用；B. protecting 保护； C. cleaning 打扫； D.
preventing阻止；句意：我认为我可以在保护环境中是有影响的。根据后文的because my
science teacher，Mrs.Esby，tells us that there are many things we can do to help protect the
environment 2 _可知此处表示我在保护环境中有影响，故选B。
32．D
考查连词及语境的理解。A. even if 即使； B. until 直到； C. because 因为； D. if如果；
句意：如果我们愿意改变我们的习惯，我们能做很多事来帮助保护环境。此处表示条件，
故用连词if。故选D。
33．A
考查动词短语及语境的理解。A. ask for要求； B. look for寻找；C. pay for支付；D. send
for派人去叫；句意：每年在我的生日聚会上，我要求慈善捐款而不是礼物。根据I asked
my friends to donate to the Natural Resources Defense Council to save the polar bears.可知此处
表示要求捐款，故选A。
34．C
考查动词及语境的理解。A. sold 出售； B. borrowed 借入； C. raised 筹集，抚养； D.
rented出租；句意：去年我筹集了几乎150美元。根据I asked my friends to donate to the
Natural Resources Defense Council to save the polar bears.可知此处表示筹集钱，故选C。
35．B
考查介词及语境的理解。A. to 向； B. for 为了；C. with 和……一起； D. off离开；句意：
想象一下如果每个人为了他们的生日要求慈善捐赠，我们为了保护环境能筹集多少钱！此
处表示目的，故用介词for，故选B。
36．A
考查名词及语境的理解。A. school 学校； B. home 家；C. factory 工厂；D. office办公室；
句意：我的全校也正在做事来帮助保护地球。根据Our school makes a carpooling(合伙用
车)program to reduce the number of cars on the road可知此处表示我的学校在帮助保护环境，
故选A。
37．D
考查代词及语境的理解。A. Her 她的； B. His 他的；C. Your 你的；D. My我的；句意：
我的科学老师Esby太太在午饭时有一个Teenie Greenies俱乐部。根据前文的because my
science teacher，Mrs.Esby，可知Mrs Esby是我的科学老师，故选D。
38．C
考查副词及语境的理解。A. still 仍然； B. yet 然而； C. also 也； D. already已经；句意：
而且我们也在做海滩清扫。此处表示我们也在做环保的事情，位于句中，故用副词also，
故选C。
39．A
试卷第8页，共3页考查动词及语境的理解。A. want 想要； B. consider 考虑；C. enjoy喜欢； D. refuse拒绝；
句意：如果你想要为环境做些事，浏览一下绿色等级的网站。want to do sth想要做某事，
故选A。
40．B
考查形容词及语境的理解。A. short 短的； B. full 满的； C. tired累的； D. fond喜欢的；
句意：对我们来说，它满是减少垃圾，再使用垃圾和重复使用垃圾的非常好的主意，它也
有很多有趣的事实。be full of充满，故选B。
【点睛】根据前后文的语境，结合时态，语态，词性，短语，句型，词义辨析和主谓一致，
选出正确的选项。例如小题3，句意：每年在我的生日聚会上，我要求慈善捐款而不是礼
物。根据I asked my friends to donate to the Natural Resources Defense Council to save the polar
bears.可知此处表示要求捐款，故选A。
五 、阅读还原6选5 根据短文内容，从方框内所给的选项中选出能填入空白处的最佳选
项，使短文意思通顺。选项中有一项为多余项。
You may be worrying about the environment and trying to change your lifestyle，for
example，riding to school or taking a shopping bag and so on.But do you know we could have a
real influence on the environment and climate(气候) change by eating less meat?
___41___ Studies have shown that keeping animals for human produces lots of greenhouse
gases(温室气体)．It's even more than all of the carbon dioxide produced by boats，planes and
trains in total around the world.Beef is worse for the environment than the other meats.___42___
However，in some countries，beef is the most-loved meat.By 2050，there will be three billion
meat-eater.That means more resources will be needed like land，water and food.
On the other hand，it would be too difficult for meat lovers to completely give up
meat.___43___ They could at first consider chicken and fish instead of red meat，such as beef，
mutton and pork.This is because productions of chicken and fish have a much less influence on
the environment.What's more，eating more fish is good for their brain.___44___ For example，
you can eat meat on only one day of the week.___45___ Some believe that it is a healthier
lifestyle while some hope to protect the environment.Anyway，we know 2015 is the hottest year
in recorded history，so it's time to think of a good way to both keep fit and help the environment.
A．Here are two steps they can follow.
B．Because lots of trees are cut down for more land for cows.
C．People stop eating meat for different reasons.
D．And they don't want to keep away from meat.
E．Then try to cut down the times of eating meat.
F．In fact，giving up meat can do much to save our planet.
试卷第9页，共3页
学科网（北京）股份有限公司【答案】41．F 42．B 43．A 44．E 45．C
【分析】本篇文章难度适中，主要讲述少吃肉可以保护环境并讲述原因以及少吃肉的方法。
41．根据空后Studies have shown that keeping animals for human produces lots of greenhouse
gases(温室气体)可知，饲养动物会产生很多温室气体，所以不吃肉对保护地球有很大的作
用。故选F。
42．根据空前Beef is worse for the environment than the other meats可知，相比其他肉，牛肉
对环境产生的影响更大，空处讲述原因，因为养牛要砍倒很多树，故选B。
43．根据空后They could at first consider chicken and fish instead of red meat，such as beef，
mutton and pork以及What's more，eating more fish is good for their brain可知，讲述了放弃
吃牛肉的两个方法，故选A。
44．根据For example，you can eat meat on only one day of the week可知，讲述减少吃肉的
次数。故选E。
45．根据Some believe that it is a healthier lifestyle while some hope to protect the environment
可知，讲述不吃肉的理由，故选C。
试卷第10页，共3页
