人教版 (2019)选择性必修 第一册Unit 5 Working the Land优秀精练

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单元知识回顾及优化集训

目标导航jing


重点
词汇
1．technique n．技能；技术；技艺
2．victim n．受害者；患者
3．loose adj.松的；未系紧的；宽松的
4．ease vi.& vt.使(宽慰)；减轻；缓解 n．容易；舒适；自在
5．wrap vt.包，裹；(用手臂等)围住
6．bath n．洗澡；(BrE＝bathtub)浴缸；浴盆；洗澡水 vt.(NAmE＝bathe)给……洗澡
7．slip vi.滑倒；滑落；溜走 n．滑倒；小错误；纸条
8．elderly adj.年纪较大的；上了年纪的
9．carpet n．地毯
10．ambulance n．救护车
11．delay vi.& vt.推迟；延期(做某事) vt.耽误；耽搁 n．延误；耽搁(的时间)；推迟
12．needle n．针；缝衣针；注射针；指针
13．panic vi.& vt.(使)惊慌 n．惊恐；恐慌
14．scream vi.& vt.(因愤怒或恐惧)高声喊；大声叫 n．尖叫；尖锐刺耳的声音
15．fellow adj.同类的；同事的；同伴的；同情况的 n．男人；家伙；同事；同辈；同类
16．choke vi.& vt.(使)窒息；(使)哽咽
17．steak n．牛排；肉排
18．desperate adj.绝望的；孤注一掷的；非常需要的
19．fist n．拳；拳头
20．grab vt.抓住；攫取 n．抓取；抢夺
21．welfare n．幸福；福祉；安康；福利
22．collapse vi.(突然)倒塌；(因病等)昏倒
23．suburb n．郊区；城外
词汇
拓展
1．minor adj.较小的；次要的；轻微的→minority n．少数；少数民族
2．electric adj.电的；用电的；电动的→electrical adj.与电有关的→electricity n．电；电学
3．urgent adj.紧急的；急迫的；急切的→urge vt.力劝；敦促；强烈要求 n．强烈的愿望
4．operator n．电话接线员；操作员→operate vt.操作；运转；动手术→operation n．运转；手术
5．bleeding n．流血；失血→bleed vi.(bled，bled)流血；失血→blood n．血液；血
6．interrupt vi.& vt.打断；打扰 vt.使暂停；使中断→interruption n．打扰
7．practical adj.切实可行的；实际的；实践的→practice n．练习；实践；惯例→practically adv.几乎；差不多；实际上
8．tightly adv.紧紧地；牢固地；紧密地→tight adj.牢固的；紧身的；绷紧的；严密的 adv.紧紧地；牢固地→tighten vt.(使)变紧；(使)加紧
9．justify vt.证明……有道理；为……辩护；是……的正当理由→justice n．正义；公正
10．foggy adj.有雾的→fog n．雾
重点
词组
1．sense of touch触觉2．electric shock触电；电击
3．help sb.to one’s feet帮助某人站起身来4．vital sign生命体征
5．face up/down面朝上(朝下)6．sleep in迟起；睡过头；睡懒觉
7．out of shape健康状况不好8．mouth-to-mouth rescue breathing口对口人工呼吸




重点
句型
1．As you can imagine，getting burnt can lead to very serious injuries.
正如你能想象的，被灼烧可能会导致非常严重的损伤。
2．You can get burnt by a variety of things：...
你可能会被各种各样的东西烧伤：……
3．Remove any clothes using scissors if necessary，unless you see the fabric sticking to the burnt skin.
如有必要，用剪刀剪掉烧伤部位的衣服，除非你看到衣服与被烧伤的皮肤粘连在一起。
4．Chen Wei，a high school student in Beijing，had his dinner interrupted when he heard someone screaming from another table.
陈伟是北京的一个高中生，当他听到另一个桌子的一个人正在尖叫时，他停下了吃饭。
5．They suggested he eat more slowly and take smaller bites before they left.
离开前，他们建议他吃饭要细嚼慢咽，小口进食。

知识点睛jing


一． ease n．容易；舒适；自在
vt.& vi.减轻；缓解；使安心；(使)宽慰
先练基础——一词多义
写出下列句子中ease的词性及汉语意思
(1)As we expected，he settled the minor problem with ease.n.容易
(2)I was not entirely at ease with the fellow diner who liked making jokes.n.自在
(3)I eased her mind by telling her that her skin was slightly swollen.v.使安心
with ease容易地；不费力地
at ease舒适；悠闲；自在
put/set sb.at ease使某人放松/自在

再提能力——完美写作·完成句子/一句多译·背诵
(4)打篮球是缓解我们巨大学习压力的最好方法，同时也能找到一些乐趣。(写作话题之体育)
Playing basketball serves as the best way to ease our great study pressure and find some pleasure at the same time.
(5)如果你每天坚持用英语写日记，你会很容易提高你的书面英语。(写作话题之语言学习)
①If you insist on keeping diaries in English every day，you can improve your written English with ease.
②Insist on keeping diaries in English every day，and you can improve your written English with ease.(用“祈使句＋and＋陈述句”改写)
二． panic vi.& vt.(panicked；panicked；panicking)(使)惊慌
n．惊慌；惊恐
先练基础——单句语法填空
(1)The big fire panicked the operator jumping from the third floor to the ground.
(2)When people heard the urgent news，they fled the village panic.
【答案】1.into ，in
•panic sb.into doing sth.使某人仓惶行事
•get into a panic陷入恐慌
in panic惊慌失措地；处在恐慌中

再提能力——完美写作·完成句子·背诵
(3)听完他的描述，所有人都陷入了恐慌。
After hearing his description，all the people got into a panic.
三．desperate adj.绝望的；孤注一掷的；非常需要的
先练基础——一词多义
写出下列句子中desperate的汉语意思
(1)The paramedic says this would be the final，desperate approach.孤注一掷的
(2)He was so desperate for a job that he would have done anything.非常需要的
(3)I decided to hug Tom tightly when he was in such a desperate position.绝望的
•be desperate for sth.渴望某物
be desperate to do sth.渴望做某事
•desperately adv.绝望地；拼命地；极严重地；非常需要
•“渴望某物/做某事”的短语还有：
be eager for sth./to do sth.
be anxious for sth./to do sth.
long for sth./to do sth.
desire for sth./to do sth.
be dying for sth./to do sth.

再提能力——完美写作·一句多译·背诵
(4)看到考试的结果，我是如此绝望，以至于我感觉好像被扔进了黑暗的世界。(读后续写之绝望心理描写)
①Seeing the result of the exam，I was so desperate that I felt as if I were thrown into a world of darkness.
②Seeing the result of the exam，so desperate was I that I felt as if I were thrown into a world of darkness.(倒装句)
(5)我渴望有机会成为一名志愿者。我的确希望您给我这个宝贵的机会。
①I am desperate for the chance to be a volunteer.I do hope you can offer me the precious opportunity.
②Desperate for the chance to be a volunteer，I do hope you can offer me the precious opportunity.(形容词短语作状语)
四． help sb.to one’s feet帮助某人站起身来
struggle to one’s feet挣扎着站起来
rise to one’s feet站起来；起身
jump to one’s feet跳起来
drag one’s feet拖着脚
stamp one’s feet跺脚

能力提升——完美写作·完成句子·背诵
(1)看到那个男孩摔倒了，我冲过去帮他站起来。
Seeing the boy fall down，I .
(2)打篮球时这孩子的腿受伤了，但是他挣扎着站了起来。
While playing basketball，the boy’s leg got injured，but .
(3)来宾进来时，请大家站起来以显示我们的礼貌。
When visitors come in， to show our politeness.
【答案】1.rushed to help him to his feet2.he struggled to his feet3.please rise to our feet
五．face down/up面朝下/上
be faced with面临
in (the) face of面对
lose face丢面子
make a face (at) 皱眉头；做苦相；做鬼脸

能力提升——完美写作·一句多译·背诵
面对巨大的挑战，我最好的朋友永远不会放弃，直到她最终成功。
(1) ，my best friend will never give up until she finally succeeds.
(2) ，my best friend will never give up until she finally succeeds.
(3) ，my best friend will never give up until she finally succeeds.
【答案】1.In (the) face of great challenges2.Facing great challenges3.Faced with great challenges
六out of shape健康状况不好；变形
in good/bad shape健康状况良好/不佳
keep/be in shape保持健康
in the shape of以……的形状/形式

能力提升——根据句意用shape短语的正确形式填空
(1)You have been sitting on my hat and now it is badly .
(2)I hadn’t been training for months and was really .
(3)She jogs for an hour every morning to .
(4)Some lanterns are fruits and they look beautiful.
【答案】1.out of shape2.out of shape3.keep/be in shape4.in the shape of
七． as引导的非限制性定语从句
As you can imagine，getting burnt can lead to very serious injuries.正如你能想象的，被灼烧可能会导致非常严重的损伤。
•本句中的as引导非限制性定语从句，来代替后面整个句子的内容。as引导非限制性定语从句时，常在从句中充当主语、宾语或表语，从句可位于句首、句中或句末。
•as引导定语从句的常用句式有：
as is known to us all/as we all know众所周知
as we can see正如我们所看到的
as is reported正如报道的那样
as is often the case这是常有的事
as is mentioned above正如上面所提到的

能力提升——完美写作·完成句子/一句多译·背诵
(1)我们能够从历史中找到一些问题的解决方法，这是常有的事。
As is often the case，we can probably find solutions to some problems from history.
(2)众所周知，兴趣是最好的老师。
①As is known to us all/As we all know，interest is the best teacher.(as引导的非限制性定语从句)
②What is known to us all is that interest is the best teacher.(what引导的主语从句)
③It is known to us all that interest is the best teacher.(it作形式主语)

分层练习


题组A 基础过关练
Ⅰ.单词拼写(根据汉语提示或首字母提示写单词)(每小题2分，共16分)
1．He was for a job for he had been out of work for two years.
2．Jack cleared his and spoke in low，polite tones to the rest of the students.
3．We can offer you suggestions on how to increase the fibre in your daily diet.
4．Last night a boy was in the river，which made his parents heart-broken.
5．Women were (尖叫) because some of the houses near the bridge were on fire.
6．When eating breakfast in a hurry，he (噎住) on a piece of toast.
7．Faced with so many angry people，he had to (为……辩护) himself for his behaviour.
8．If a tooth feels very (松的)，your dentist may recommend that it be taken out.
【答案】1.desperate 2.throat 3.practical 4.drowned 5.screaming6.choked7.justify8.loose
Ⅱ.词形变化填空(用括号内所给词的适当形式填空)(每小题2分，共14分)
9．It is certain that the engineer has a good knowledge of .(electric)
10．My boss me to deal with the most matters every day.(urgent)
11．The doctor has just on the girl and the is quite successful.(operate)
12．His finger cut by the knife was and he lost much .(blood)
13．Will you stop me when I am talking? Your upsets my mind.(interrupt)
14． he learning practical knowledge and tried to put it into .(practical)
15．Not having seen me for many years，he hugged me (tight) when we met again.
【答案】9.electrical ，electricity10.urgent 11.operated ，operation 12.bleeding ，blood13.interrupting ，interruption 14.Practically ，practiced ，practical ，practice15.tightly
Ⅲ.经典句型仿写(每小题4分，共20分)
16．正如一句古老谚语所说，“有志者事竟成。”(as引导的非限制性定语从句)
，“Where there is a will，there is a way.”
17．不幸的是，我们在人群中被分开了。(get done)
Unfortunately，we .
18．除非被邀请，否则我不会参加晚会。(unless)
I won’t attend the party .
19．我强烈建议你多读中国历史方面的书籍。(suggest)
on Chinese history.
20．我听到一条河在附近流淌。(hear＋宾语＋宾补)
I .
【答案】16.As an old saying goes17.got separated in the crowd18.unless (I am) invited19.I strongly suggest that you (should) read more books 20. heard a river flowing nearby
题组B 能力提升练
请先从表格中选用本单元所学词汇完成下列短文，然后核对答案并背诵该短文。(文中加波浪线的句子为本单元的语法项目：动词-ing形式)

Many leaflets and manuals offer practical techniques on first aid，which state that calling emergency numbers without 1. is the first step.But before paramedics in the ambulance come，you can save yourself or look after others’ welfare by using first aid.If you get burned by radiation，acids or other chemicals，don’t 2. or scream.Instead，remove any clothes unless you see fabric sticking to the burned skin.Then wash it under the running water.With your skin swollen and full of blisters or with your nerves damaged，there is an 3. need to rush to hospital.Swallowing foods too quickly can cause you to get 4. on steak，toast or anything else with ease.Then，people around you can slap on your back，forcing the obstruction out.As for a 5. nose，neither should you keep your face up，nor should you press the nose tightly.You can use the mouth-to-mouth rescue breathing method to save a drowned man.You can apply cold water to the sprained ankle.All in all，learning some first aid makes a great difference.
【答案】1.delay 2.panic 3.urgent 4.choked 5.bleeding

题组C 培优拔尖练
Ⅰ.完形填空
[一]
On a bright Friday afternoon，Tulic was enjoying walking in the streets of New York.At the City Hall station，she 1 onto a bench.It was just after 2 pm.Only a few people were at the station.A man leaned against a pillar(柱子)，the 2 anyone might，waiting for the train.The silence was interrupted by a(n) 3 that the next train was two stations away.Then Tulic sensed the man at the pillar 4 forward onto the tracks.
A man who was 5 waiting for the train on the platform ran over，looked over the edge，and then jumped onto the tracks.The man who had fallen was not moving.Two more men jumped down to help.
“I don’t know where these men got the wit and the quickness，” Tulic said.“The man who fell was about six feet tall.He was 6 jammed in the tracks.They were 7 to know that the train was coming.”
The three men 8 him from below and rolled him onto the platform.Then the rescuers themselves were 9 ，pulled back to safety by helping hands. 10 they were all clear，the train pulled in.People getting off the train walked around this unconscious man.
He was not，however， 11 .Two of the men who had jumped onto the platform were 12 his hands，saying，“Buddy，you’re going to be fine.”
Then a(n) 13 arrived，and the man was taken to a local hospital.
That is the greatest thing.The infrastructure in this city of millions is the people themselves 14 ，being there for others.Even without the slightest 15 of the person，strangers offered to lend a helping hand to him in an emergency.The scene was beautiful to see!
语篇解读　本文是一篇夹叙夹议的文章。文章讲述了Tulic目睹人们在火车站台，面对驶来的火车毫不畏惧，英勇救人的故事。

1．A.slipped B．settled C．turned D．decided
B【解析】句意为：在市政厅车站，她坐在长凳上。slip滑倒；settle停留，坐下；turn转动；decide决定。故选B。
2．A.manner B．style C．way D．behavior
C【解析】　句意为：一个男人靠在一根柱子上，像任何人一样，在等火车。manner方式(侧重指礼仪)；style样式(侧重指款式)；way方法(表示做事的方式、方法)；behavior行为(侧重指行为习惯)。故选C。
3．A.report B．poster C．announcement D．note
C【解析】句意为：一阵广播播报声打破了寂静，说下一班火车在两站之外。report报告；poster海报；announcement公告，宣布；note笔记。故选C。
4．A.crushing B．chasing C．carrying D．collapsing
D【解析】crush压碎；chase追赶；carry携带；collapse昏倒，坍塌。根据后文“The man who had fallen was not moving.”可知，靠着柱子的那个人昏倒在了铁轨上。故选D。
5．A.also B．again C．never D．seldom
A【解析】句意为：一个同样在站台上等火车的男人跑了过来，从边上看了看，然后跳到了铁轨上。also也；again再一次；never从不；seldom几乎不。故选A。
6．A.far from B．kind of C．scores of D．apart from
B【解析】句意为：他在火车轨道上有点动弹不得。far from远离；kind of有点；scores of许多，大量；apart from除了。故选B。
7．A.nervous B．embarrassed C．depressed D．hopeful
A【解析】句意为：知道火车要来了，他们很紧张。nervous紧张的；embarrassed尴尬的；depressed沮丧的；hopeful有希望的。故选A。
8．A.pulled B．sent C．threw D．lifted
D【解析】句意为：那三个人把他从下面抬起来，放到了站台上。pull拉；send送；throw扔掉；lift抬起，举起。故选D。
9．A.loosed B．rescued C．liberated D．released
B【解析】句意为：然后，很多人伸出援手，那些救援者也被救起来，被拉回到了安全地带。loose松开；rescue拯救；liberate解放，使自由；release释放。故选B。
10．A.As long as B．Given that C．As soon as D．Assuming that
C【解析】句意为：他们刚一离开，火车就进站了。as long as只要；given that考虑到，鉴于；as soon as一……就；assuming that假如。故选C。
11．A.lonely B．only C．alone D．single
C【解析】句意为：然而，他并不孤单。lonely孤独，侧重情感上；only只有，仅仅；alone独自，单独；single单个的。根据后文“Buddy，you’re going to be fine.” 可知，此处指那个昏倒的乘客并不孤单。故选C。
12．A.holding B．wagging C．kissing D．embracing
A【解析】句意为：其中两名跳上站台的男子握着他的手说：“伙计，你会没事的。”hold握住；wag摇动；kiss吻；embrace拥抱。故选A。
13．A.ambulance B．conductor C．survivor D．instrument
A【解析】句意为：随后一辆救护车赶到，这名男子被送往当地一家医院。ambulance救护车；conductor指挥，列车长，售票员；survivor幸存者；instrument器械。故选A。
14．A.taking B．claiming C．exchanging D．providing
D【解析】句意为：在这座数百万人的城市里，公共建设是由人们自己提供，为他人服务。take带走；claim宣称；exchange交换；provide提供。故选D。
15．A.instruction B．knowledge C．assistance D．guidance
B【解析】句意为：即使不认识这个人，陌生人在紧急情况下也向他伸出援助之手。instruction指令；knowledge知识；assistance帮助；guidance指导。故选B。
[二]
Hello，Mr Wi-Fi.Life without you is next to impossible.We’re happy to sing your name from morning till evening，sometimes till dawn. 1 I know you help me，sometimes you’re making me do things with 2 attention.Many times I promise myself that I’ll 3 my feelings towards you，but you’re 4 me closer and closer...You’ve entered both my home and my workplace.You’re just a window for our 5 and information.But we people aren’t 6 only with the window，so we open all our doors for you.Is this a(n) 7 or some kind of attachment? If this is an illness，is it curable? And if this is an attachment，will you 8 me to the lifelong togetherness?
We want you all days.Can’t you take a few days off so that both you and I can 9 ？ You’re a poison—not a slow one but a super-fast poison which holds our mind and makes us dance 10 its tune.Nowadays you’re so 11 that anyone can buy and make you our companion.You’ll never be bothered about our health but we’ll 12 be concerned about your “health”．Because you accompany us everywhere and never let us be alone.
If you were a 13 person made of flesh and blood，would we love you the same? You control us with your numerous talents and we even can’t get rid of you.We’re all your 14 .Sometimes I wonder how people in the previous generations 15 ，but if they did why can’t we?
语篇解读　本文是一篇记叙文。文章用拟人的手法控诉了Wi-Fi已经控制了人们的生活，人们都成了它的奴隶。

1．A.Now that B．Only if C．Though D．When
C【解析】句意为：虽然我知道你会帮助我，但有时你会让我做事时分神。now that既然；only if只有；though尽管；when当……时候。根据句意可知前后是让步关系，此处表示“尽管，虽然”。故C项正确。
2．A.praised B．increased C．focused D．divided
D【解析】句意见上题解析。praise表扬；increase增加；focus集中；divide分开。根据常识可知，Wi-Fi很容易让人做事的时候分神。故D项正确。
3．A.keep on B．bring back C．approve of D．give up
D【解析】句意为：很多次我向自己保证，我会放弃对你的感情，但你却不断地吸引我靠近。keep on继续；bring back带回；approve of赞成；give up放弃。故D项正确。
4．A.forcing B．pushing C．drawing D．observing
C【解析】force强迫；push推；draw吸引；observe观察。根据常识可知，人们很难抵抗Wi-Fi的诱惑，且根据空后的“closer and closer”可知，此处表示Wi-Fi会把人们吸引到它身边。故C项正确。
5．A.entertainment B．argument C．expansion D．struggle
A【解析】句意为：你是我们娱乐和获取信息的一扇窗。entertainment消遣，娱乐；argument争论；expansion扩展；struggle努力。故A项正确。
6．A.strict B．satisfied C．generous D．busy
B【解析】句意为：但我们人类不满足于仅仅是一扇窗，所以我们为你敞开所有的大门。strict严厉的；satisfied满意的，满足的；generous慷慨的；busy忙碌的。故B项正确。
7．A.disease B．inspiration C．routine D．situation
A【解析】句意为：这是一种病还是某种依恋？disease疾病；inspiration灵感；routine常规；situation形势。根据下文提到的“If this is an illness”可知，此处指“疾病”。故A项正确。
8．A.recommend B．instruct C．promise D．adapt
C【解析】句意为：如果这是一种依恋，你会承诺永远和我在一起吗？recommend推荐；instruct指导；promise承诺；adapt适应。故C项正确。
9．A.persist B．relax C．progress D．balance
B【解析】句意为：你不能请几天假让我和你都放松一下吗？persist坚持；relax放松；progress前进；balance平衡。故B项正确。
10．A.within B．against C．from D．to
D【解析】句意为：你是一种(药效)奇快的毒药，它控制着我们的思想，让我们跟着它的旋律跳舞。dance to表示“随着……起舞”。故D项正确。
11．A.affordable B．valuable C．conventional D．attractive
A【解析】句意为：现在你是如此的实惠，任何人都可以买你，让你成为我们的伴侣。affordable买得起的；valuable贵重的；conventional传统的；attractive吸引人的。故A项正确。
12．A.sometimes B．always C．never D．seldom
B【解析】句意为：你永远不会担心我们的健康，但我们会一直关心你的“健康”。sometimes有时；always总是，一直；never从不；seldom很少。故B项正确。
13．A.selfish B．dishonest C．responsible D．real
D【解析】句意为：如果你是一个有血有肉的真人，我们会同样爱你吗？selfish自私的；dishonest不诚实的；responsible可靠的；real真实的。故D项正确。
14．A.friends B．slaves C．colleagues D．employers
B【解析】句意为：我们都成了你的奴隶。friend朋友；slave奴隶；colleague同事；employer雇主。故B项正确。
15．A.suffered B．connected C．survived D．surfed
C【解析】句意为：有时我在想前几代人是怎么熬过来的，但如果他们都熬过来了，为什么我们就不能？suffer受苦；connect连接；survive幸存，从……中坚持过来；surf冲浪。故C项正确。
Ⅱ.语法填空
When people hear the word “rat”，they may think of dirty animals that spread disease.You may also connect the word “rat” with bad expressions.Indeed，rats generally are not beloved animals either in life 1. the English language.But the rat trainers at the nonprofit organization，APOPO，see the animals very 2. (different)．They consider the rats lifesavers.3. (base) in Tanzania，APOPO trains giant rats to find landmines(地雷)．And the rats with their extraordinary sense of smell are very suitable 4. the job.APOPO calls their animal team HeroRats.
Worldwide there are 110 million hidden explosives left over from war.These explosives are still “live”，or able to explode.Such landmines kill or wound 5 000 people 5.
year.Humans 6. (use) metal-searching devices to do this work for years.But trained rats do it better and also cost less money.When the rats 7. (work) in the field find a landmine，they scratch on the ground.That’s how we know.We place a little marker there，and then we can safely remove those and get rid of 8. (they)．
The giant pouched rat is large compared to other kinds of 9. (rat)．However，they still do not weigh enough 10. (cause) a landmine to explode.So these rats can really be heroes.They show every day that they are worthy of that name.
语篇解读　这是一篇说明文。文章主要介绍了非营利组织APOPO训练巨型老鼠寻找地雷，拥有非凡嗅觉的老鼠非常适合这项工作。

1.　or【解析】考查固定短语。句意为：的确，无论是在生活中还是在英语语言中，老鼠通常都不是受人喜爱的动物。either...or...无论是……还是……。故填or。
2.　differently【解析】考查副词。修饰动词see应用副词differently。故填differently。
3.　Based【解析】考查非谓语动词。分析句子结构可知，base在句中应用非谓语动词形式，与逻辑主语APOPO构成被动关系，故应用过去分词作定语。句首单词首字母要大写。故填Based。
4.　for【解析】考查介词。句意为：而拥有非凡嗅觉的老鼠非常适合这项工作。be suitable for适合于……。故填for。
5.　a【解析】考查冠词。year为可数名词，此处表泛指，应用不定冠词，且year是发音以辅音音素开头的单词，应用a。故填a。
6.　have used【解析】考查动词的时态。根据后文“for years”可知，应用现在完成时，主语为Humans，助动词应用have。故填have used。
7.　working【解析】考查非谓语动词。分析句子结构可知，work在从句中应用非谓语动词形式，与其逻辑主语rats构成主动关系，故应用现在分词作定语。故填working。
8.　them【解析】考查代词。此处作介词of的宾语应用代词them。故填them。
9.　rats【解析】考查名词单复数。rat为可数名词，此处指其他种类的老鼠，应用复数形式。故填rats。
10.　to cause【解析】考查非谓语动词。句意为：然而，它们的重量仍然不足以引起地雷爆炸。结合句意可知，表示“足以做某事”用短语enough to do sth.。故填to cause。