Period 4 单元语法讲练
关系副词引导的定语从句
关系副词在定语从句中作状语。常用的关系副词有when，where和why。
一、关系副词when引导的定语从句
1．先行词往往是表示时间的名词，如time，day，hour，month，year等，when在从句中作时间状语。
I'll never forget the days when we stayed in the countryside．
我永远忘不了我们在乡下待过的日子。
2．when还可以引导非限制性定语从句。
In the old days，when our country was not so strong，peasants lived a hard life．
在过去，我们的国家还没有这么富强的时候，农民们过着艰苦的生活。
The sports meeting will be put off till next month，when we will have made all the preparations．
运动会将被推迟到下个月，那时我们将做好一切准备。
[即时训练1] 单句语法填空
①Winter is the time of year ________ the day is short while the night is long．
②I'm seeing the manager tomorrow, ______ he will be back from New York．
二、关系副词where引导的定语从句
1．先行词往往是表示地点的名词，如place，room，house，spot，school，country等，where在从句中作地点状语。
They went into the hall where the meeting was being held．
他们走进正在开会的大厅。
2．where还可以引导非限制性定语从句。
Opposite is St．Paul's Church，where you can hear some lovely music．
对面是圣保罗大教堂，在那里你可以听到一些美妙的音乐。
[名师点津] where引导定语从句和状语从句的区别
引导定语从句时，where在从句中作地点状语，其前有表示地点的名词作先行词。引导状语从句时，where虽然也在从句中作状语，但前面没有表示地点的名词。
He's got himself into a dangerous situation where he is likely to lose control over the plane．(定语从句)
他使自己陷入了一种危险的情况，他很可能会失去对飞机的控制。
When you read the book，you'd better make a mark where you have questions．(状语从句)
当你读这本书的时候，你最好在有疑问的地方做一下标记。
[即时训练2] 单句语法填空
①We have reached a point _________a change is needed．
②We should go ________we are needed．
三、关系副词why引导的定语从句
先行词是表示原因的名词 reason, why在从句中作原因状语。
The reason why he was absent sounds reasonable．
他缺席的原因听起来很合理。
[名师点津] why不能引导非限制性定语从句。当先行词是 reason时，应该用 for which 引导非限制性定语从句。
[即时训练3] 单句语法填空
①The time _________we got together finally arrived．
②I don't know the reason ________ he looks unhappy today．
③The house ________ I lived ten years ago has been pulled down．
短文语境填空
This is the village 1．________ I was brought up，2．________ is surrounded by trees and mountains．I still remember the days 3．________ I played with my little friends．We often went to a nearby river，4．________ we caught fish．But we usually went home late．That's the reason 5．________ I often was scolded by my parents．Although there were only three hundred people，the people enjoyed 6．________(them) and got along well 7．________ each other．They worked in the field，8．________ a variety of crops were planted．The only school was 9．________(locate) in the centre of the village，10．________ I studied．
Period 4
单元语法
即时训练1 ①when ②when
即时训练2 ①where ②where
即时训练3 ①when ②why ③where
巩固落实
短文语境填空
1．where 2．which 3．when 4．where 5．why
6．themselves 7．with 8．where 9．located 10．where
1 / 3(共39张PPT)
Period 4
UNIT 5 HUMANS AND NATURE
主题语境
人与自然——人类社会生存、社会发展与环境的关系
Section Ⅰ TOPIC TALK & LESSON 1
关系副词引导的定语从句
关系副词在定语从句中作状语。常用的关系副词有when，where和why。
一、关系副词when引导的定语从句
1．先行词往往是表示时间的名词，如time，day，hour，month，year等，when在从句中作时间状语。
I'll never forget the days when we stayed in the countryside．
我永远忘不了我们在乡下待过的日子。
课时学案 单元语法讲练
2．when还可以引导非限制性定语从句。
In the old days，when our country was not so strong，peasants lived a hard life．
在过去，我们的国家还没有这么富强的时候，农民们过着艰苦的生活。
The sports meeting will be put off till next month，when we will have made all the preparations．
运动会将被推迟到下个月，那时我们将做好一切准备。
[即时训练1] 单句语法填空
①Winter is the time of year _____ the day is short while the night is long．
②I'm seeing the manager tomorrow, _____ he will be back from New York．
when
when
二、关系副词where引导的定语从句
1．先行词往往是表示地点的名词，如place，room，house，spot，school，country等，where在从句中作地点状语。
They went into the hall where the meeting was being held．
他们走进正在开会的大厅。
2．where还可以引导非限制性定语从句。
Opposite is St．Paul's Church，where you can hear some lovely music．
对面是圣保罗大教堂，在那里你可以听到一些美妙的音乐。
[名师点津] where引导定语从句和状语从句的区别
引导定语从句时，where在从句中作地点状语，其前有表示地点的名词作先行词。引导状语从句时，where虽然也在从句中作状语，但前面没有表示地点的名词。
He's got himself into a dangerous situation where he is likely to lose control over the plane．(定语从句)
他使自己陷入了一种危险的情况，他很可能会失去对飞机的控制。
When you read the book，you'd better make a mark where you have questions．(状语从句)
当你读这本书的时候，你最好在有疑问的地方做一下标记。
[即时训练2] 单句语法填空
①We have reached a point ______a change is needed．
②We should go ______we are needed．
where
where
三、关系副词why引导的定语从句
先行词是表示原因的名词 reason, why在从句中作原因状语。
The reason why he was absent sounds reasonable．
他缺席的原因听起来很合理。
[名师点津] why不能引导非限制性定语从句。当先行词是 reason时，应该用 for which 引导非限制性定语从句。
[即时训练3] 单句语法填空
①The time _____we got together finally arrived．
②I don't know the reason ____ he looks unhappy today．
③The house _____ I lived ten years ago has been pulled down．
when
why
where
短文语境填空
This is the village 1．_____ I was brought up，2．_____ is surrounded by trees and mountains．I still remember the days 3．_____ I played with my little friends．We often went to a nearby river，4．_____ we caught fish．But we usually went home late．That's the reason 5．____ I often was scolded by my parents．Although there were only three hundred people，the people enjoyed 6．__________(them) and got along well 7．____ each other．They worked in the field，8．______ a variety of crops were planted．The only school was 9．_______(locate) in the centre of the village，10．_____ I studied．
where
which
when
where
why
themselves
with
where
located
where
Ⅰ．单词拼写
1．The pilots had to take emergency action to avoid a _______(灾难)．
2．The crops died during the _______(干旱)．
3．She made helpful _________(评论) on my work．
4．Of the six people injured in the crash，only two ________(幸存)．
5．He _______(逃离) from prison this morning．
课时分层作业(四)
disaster
drought
comments
survived
escaped
Ⅱ．单句语法填空
1．I admired my father，and his work filled me with_________
(curious)．
2．His parents frightened him into _____(go) to school．
3．I must have been in a ________(shock) state last night．
4．Rescue teams are using thermal imaging to locate_________
(survivor) of the earthquake．
5．The more expensive the salt is, the ______(fast) it can be sold．
curiosity
going
shocking
survivors
faster
Ⅲ．阅读理解
A
The list below includes a few of our favorite online writing classes, perfect for writers of all levels．
Catapult
Starting At $15 for a day
Catapult offers a series of online writing lectures and classes, and many of the instructors are famous authors or magazine editors．Our team has taken a six-week writing course, including a one-day editing course, and a creative non-fiction class—all online．With online courses of all lengths and covering various types, it's perfect for everyone．
Master Class
Starting At $15/month
Master Class is one of our favorite websites for learning about all things, including writing．The instructor list has big names．This is a great choice if you want courses you can take at your own pace and videos you can revisit again and again．
One Story
Starting At $55 (three-day)
One Story is a magazine bringing people together through reading, writing, and learning about short stories．In addition to its mission of publishing one short story at a time, it offers affordable online writing lectures and classes throughout the year．
Write or Die Magazine
Starting At $12 for a self-guided course Write or Die Magazine is offering writers resources, inspiration, and connection．The website has plenty of free things and affordable self-guided classes to help you build a good habit of writing and overcome common fears and doubts associated with writing．If you have a serious project in the works, the platform also includes one-on-one coaching．
【语篇解读】 本文是一篇应用文。文章介绍了四个网络写作课程。
1．Who is the text specially intended for
A．Parents． B．Tourists．
C．Scientists． D．Writers．
D [推理判断题。根据文章第一段“The list below includes a few of our favorite online writing classes, perfect for writers of all levels．”可知，这篇文章是写给作家的。故答案为D。]
√
2．From which website can you get things free of charge
A．Catapult． B．Master Class．
C．One Story． D．Write or Die Magazine．
D [细节理解题。根据Write or Die Magazine部分中“The website has plenty of free things and affordable self-guided classes to help you build a good habit of writing and overcome common fears and doubts associated with writing．”可知，Write or Die Magazine网站上有很多免费的资料。故答案为D。]
√
3．What is the text
A．A course report． B．A short story．
C．An advertisement． D．A book review．
C [推理判断题。根据文章内容可知，文章介绍了四个网络写作课程，包含每个课程的内容和费用，应属于广告。故答案为C。]
√
B
One night, Pilar was in a deep sleep when she was woken by her cat Inti．Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen．Pilar could easily have lost her life, but Inti would not let that happen．Even though Inti could have escaped the house through a cat door, he wouldn't leave Pilar．
As amazing as this story is, it is not as uncommon as you may think．Take the example of Charlotte Lee and her horse, Thunder．One summer night, the whole family was asleep with the windows open．It was normally very quiet where they lived．Suddenly, there was a loud noise．Charlotte woke up from her sweet dream, and the noise continued．Then she heard a horse running fast towards the house．The next thing she saw was Thunder standing outside her window, neighing and shaking his head．She knew something was wrong．Charlotte quickly got everyone out of the house before the earthquake hit．Thunder has saved her life．
There are also stories of animals coming to the rescue of humans．One animal known to be a friend of humans is the dolphin．Once, Todd Endris was surfing with his friends when he was attacked by a 13-foot (4-meter) shark．In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Todd until he could get safely to the shore．Without the help of the dolphins, there is little chance that Todd could have escaped．
No one is sure why animals have so often come to our rescue．However, it is clear that humans and animals enjoy a close relationship．It is important that we care for them as much as we can．
【语篇解读】 本文是一篇记叙文。文章讲述了几则动物救人的故事。
4．Why did Inti throw himself against the door
A．He was trying to wake up his owner．
B．He wanted to get out of the room．
C．He felt bored and was playing by himself．
D．He couldn't find the way out because of smoke．
√
A [细节理解题。根据第一段中“Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．”可知，Inti使劲撞门是为了叫醒主人Pilar，让她知道房子着火了。故选A项。]
5．What did Charlotte do before the earthquake
A．She closed the windows．
B．She was sleeping deeply．
C．She ran to warn her neighbors．
D．She got her horse out of the stable．
B [细节理解题。根据第二段中“Charlotte woke up from her sweet dream, and the noise continued．”可知，地震前Charlotte睡得很沉。故选B项。]
√
6．What do we know about Inti and Thunder
A．They were shy and quiet．
B．They used to make noise at night．
C．They were brave and smart．
D．They saved their owners several times．
√
C [推理判断题。根据第一段中“Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen．”可知，Inti在火灾发生时拼命叫醒主人，让她及时逃走。根据第二段中“Then she heard a horse running fast towards the house．The next thing she saw was Thunder standing outside her window, neighing and shaking his head．She knew something was wrong．Charlotte quickly got everyone out of the house before the earthquake hit．Thunder has saved her life．”可知，Thunder在地震发生前警示主人，让她带着家人离开房子。由此可知，Inti和Thunder在危险来临时都非常勇敢，而且很聪明。故选C项。]
7．Which of the following is probably Todd's feeling towards the dolphins
A．Doubtful． B．Grateful．
C．Frightened． D．Bored．
√
B [推理判断题。根据第三段中“In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Todd until he could get safely to the shore．Without the help of the dolphins, there is little chance that Todd could have escaped．”可知，海豚保护Todd免受鲨鱼的攻击，让他成功逃脱。由此推知，Todd对于海豚应该是充满感激的(Grateful)。故选B项。]
Ⅳ．阅读七选五
In 2017，the documentary Spy in the Wild (《荒野间谍》) gave us a chance to look much more closely into the world of animals through the eyes of “animal spies”． 1 They “live” together with animals in order to record their lives．
Returning for its second season，Spy in the Wild follows the tradition of the first season while introducing new cameras and robots． 2 For example，a spy turtle can lay robot eggs，a spy squirrel can gather robot nuts，and monkeys can play with a spy snowball．
In the new season，more than 50 spy robots are sent to study animals in all kinds of environments，from under the Pacific Ocean to the Arctic． 3 They study the emotional connections that are shared between animals first-hand．For example，a spy penguin was accepted as part of a group in South Georgia Island． 4 “Quite accidentally，our spy creature is at the center of something special，capturing (捕捉到) emotions that have seldom been watched，” series narrator (旁白员) David Tennant told CNET．
5 “The whole point is ...trying to get closer than we ever have before to capture those elusive (难以达到的) moments when they start to show the kind of emotions we have，”director John Downer told PBS．
A．It won lots of praise from the audience．
B．But these spies don't just record everyday goings-on．
C．These spies are actually robots with cameras that look like real animals．
D．With the help of these robots，these “animal spies” can do many things．
E．It uncovers how different we are compared to our animal cousins．
F．The documentary aims to record animal behaviour that we would rarely see．
G．It watched on as penguin parents tried hard to make it home to feed their chicks．
【语篇解读】 本文是一篇说明文。文章介绍了英国广播公司的纪录片《荒野间谍》，让我们有机会通过“动物间谍”的眼睛近距离地观察动物世界。
1．C [根据文章“In 2017，the documentary Spy in the Wild gave us a chance to look much more closely into the world of animals through the eyes of ‘animal spies’．”和下句“They ‘live’ together with animals in order to record their lives．”可知段中应该有一个过渡句，C项符合题意，故选C。]
2．D [根据文章“Returning for its second season，Spy in the Wild follows the tradition of the first season while introducing new cameras and robots．”以及“For example，a spy turtle can lay robot eggs，a spy squirrel can gather robot nuts，and monkeys can play with a spy snowball．”可知，中间需要一个过渡句来顺承，所以D项符合，故选D。]
3．B [根据文章“In the new season，more than 50 spy robots are sent to study animals in all kinds of environments，from under the Pacific Ocean to the Arctic．”以及下文的They的回指，只有B和C选项涉及名词复数，C选项已经用过，所以B项符合题意，故选B。]
4．G [根据文章“For example，a spy penguin was accepted as part of a group in South Georgia Island．”以及后文“Quite accidentally，our spy creature is at the center of something special，capturing emotions that have seldom been watched”可知应该有一个过渡句，所以选G。]
5．F [根据文章“‘The whole point is ...trying to get closer than we ever have before to capture those elusive moments when they start to show the kind of emotions we have，’director John Downer told PBS．”可知，设空处应该是考查段落主旨大意，故F项符合题意，故选F。]
THANKSUNIT 5 HUMANS AND NATURE
课时分层作业(四)
Ⅰ．单词拼写
1．The pilots had to take emergency action to avoid a ________(灾难)．
2．The crops died during the ________(干旱)．
3．She made helpful ________(评论) on my work．
4．Of the six people injured in the crash，only two ________(幸存)．
5．He ________(逃离) from prison this morning．
Ⅱ．单句语法填空
1．I admired my father，and his work filled me with ________(curious)．
2．His parents frightened him into ________(go) to school．
3．I must have been in a ________(shock) state last night．
4．Rescue teams are using thermal imaging to locate ________(survivor) of the earthquake．
5．The more expensive the salt is, the ______(fast) it can be sold．
Ⅲ．阅读理解
A
The list below includes a few of our favorite online writing classes, perfect for writers of all levels．
Catapult
Starting At $15 for a day
Catapult offers a series of online writing lectures and classes, and many of the instructors are famous authors or magazine editors．Our team has taken a six-week writing course, including a one-day editing course, and a creative non-fiction class—all online．With online courses of all lengths and covering various types, it's perfect for everyone．
Master Class
Starting At $15/month
Master Class is one of our favorite websites for learning about all things, including writing．The instructor list has big names．This is a great choice if you want courses you can take at your own pace and videos you can revisit again and again．
One Story
Starting At $55 (three-day)
One Story is a magazine bringing people together through reading, writing, and learning about short stories．In addition to its mission of publishing one short story at a time, it offers affordable online writing lectures and classes throughout the year．
Write or Die Magazine
Starting At $12 for a self-guided course Write or Die Magazine is offering writers resources, inspiration, and connection．The website has plenty of free things and affordable self-guided classes to help you build a good habit of writing and overcome common fears and doubts associated with writing．If you have a serious project in the works, the platform also includes one-on-one coaching．
1．Who is the text specially intended for
A．Parents． B．Tourists．
C．Scientists． D．Writers．
2．From which website can you get things free of charge
A．Catapult． B．Master Class．
C．One Story． D．Write or Die Magazine．
3．What is the text
A．A course report． B．A short story．
C．An advertisement． D．A book review．
B
One night, Pilar was in a deep sleep when she was woken by her cat Inti．Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen．Pilar could easily have lost her life, but Inti would not let that happen．Even though Inti could have escaped the house through a cat door, he wouldn't leave Pilar．
As amazing as this story is, it is not as uncommon as you may think．Take the example of Charlotte Lee and her horse, Thunder．One summer night, the whole family was asleep with the windows open．It was normally very quiet where they lived．Suddenly, there was a loud noise．Charlotte woke up from her sweet dream, and the noise continued．Then she heard a horse running fast towards the house．The next thing she saw was Thunder standing outside her window, neighing and shaking his head．She knew something was wrong．Charlotte quickly got everyone out of the house before the earthquake hit．Thunder has saved her life．
There are also stories of animals coming to the rescue of humans．One animal known to be a friend of humans is the dolphin．Once, Todd Endris was surfing with his friends when he was attacked by a 13-foot (4-meter) shark．In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Todd until he could get safely to the shore．Without the help of the dolphins, there is little chance that Todd could have escaped．
No one is sure why animals have so often come to our rescue．However, it is clear that humans and animals enjoy a close relationship．It is important that we care for them as much as we can．
4．Why did Inti throw himself against the door
A．He was trying to wake up his owner．
B．He wanted to get out of the room．
C．He felt bored and was playing by himself．
D．He couldn't find the way out because of smoke．
5．What did Charlotte do before the earthquake
A．She closed the windows．
B．She was sleeping deeply．
C．She ran to warn her neighbors．
D．She got her horse out of the stable．
6．What do we know about Inti and Thunder
A．They were shy and quiet．
B．They used to make noise at night．
C．They were brave and smart．
D．They saved their owners several times．
7．Which of the following is probably Todd's feeling towards the dolphins
A．Doubtful． B．Grateful．
C．Frightened． D．Bored．
Ⅳ．阅读七选五
In 2017，the documentary Spy in the Wild (《荒野间谍》) gave us a chance to look much more closely into the world of animals through the eyes of “animal spies”． 1 They “live” together with animals in order to record their lives．
Returning for its second season，Spy in the Wild follows the tradition of the first season while introducing new cameras and robots． 2 For example，a spy turtle can lay robot eggs，a spy squirrel can gather robot nuts，and monkeys can play with a spy snowball．
In the new season，more than 50 spy robots are sent to study animals in all kinds of environments，from under the Pacific Ocean to the Arctic． 3 They study the emotional connections that are shared between animals first-hand．For example，a spy penguin was accepted as part of a group in South Georgia Island． 4 “Quite accidentally，our spy creature is at the center of something special，capturing (捕捉到) emotions that have seldom been watched，” series narrator (旁白员) David Tennant told CNET．
5 “The whole point is ．．．trying to get closer than we ever have before to capture those elusive (难以达到的) moments when they start to show the kind of emotions we have，”director John Downer told PBS．
A．It won lots of praise from the audience．
B．But these spies don't just record everyday goings-on．
C．These spies are actually robots with cameras that look like real animals．
D．With the help of these robots，these “animal spies” can do many things．
E．It uncovers how different we are compared to our animal cousins．
F．The documentary aims to record animal behaviour that we would rarely see．
G．It watched on as penguin parents tried hard to make it home to feed their chicks．
课时分层作业(四)
Ⅰ．1．disaster 2．drought 3．comments 4．survived 5．escaped
Ⅱ．1．curiosity 2．going 3．shocking 4．survivors 5．faster
Ⅲ．
1 2 3 4 5 6 7
D D C A B C B
Ⅳ．
1 2 3 4 5
C D B G F
Ⅲ．【语篇解读】 本文是一篇应用文。文章介绍了四个网络写作课程。
1．D [推理判断题。根据文章第一段“The list below includes a few of our favorite online writing classes, perfect for writers of all levels．”可知，这篇文章是写给作家的。故答案为D。]
2．D [细节理解题。根据Write or Die Magazine部分中“The website has plenty of free things and affordable selfguided classes to help you build a good habit of writing and overcome common fears and doubts associated with writing．”可知，Write or Die Magazine网站上有很多免费的资料。故答案为D。]
3．C [推理判断题。根据文章内容可知，文章介绍了四个网络写作课程，包含每个课程的内容和费用，应属于广告。故答案为C。]
【语篇解读】 本文是一篇记叙文。文章讲述了几则动物救人的故事。
4．A [细节理解题。根据第一段中“Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．”可知，Inti使劲撞门是为了叫醒主人Pilar，让她知道房子着火了。故选A项。]
5．B [细节理解题。根据第二段中“Charlotte woke up from her sweet dream, and the noise continued．”可知，地震前Charlotte睡得很沉。故选B项。]
6．C [推理判断题。根据第一段中“Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door．When Pilar opened her eyes, she saw that her bedroom was filled with smoke．As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen．”可知，Inti在火灾发生时拼命叫醒主人，让她及时逃走。根据第二段中“Then she heard a horse running fast towards the house．The next thing she saw was Thunder standing outside her window, neighing and shaking his head．She knew something was wrong．Charlotte quickly got everyone out of the house before the earthquake hit．Thunder has saved her life．”可知，Thunder在地震发生前警示主人，让她带着家人离开房子。由此可知，Inti和Thunder在危险来临时都非常勇敢，而且很聪明。故选C项。]
7．B [推理判断题。根据第三段中“In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Todd until he could get safely to the shore．Without the help of the dolphins, there is little chance that Todd could have escaped．”可知，海豚保护Todd免受鲨鱼的攻击，让他成功逃脱。由此推知，Todd对于海豚应该是充满感激的(Grateful)。故选B项。]
Ⅳ．【语篇解读】 本文是一篇说明文。文章介绍了英国广播公司的纪录片《荒野间谍》，让我们有机会通过“动物间谍”的眼睛近距离地观察动物世界。
1．C [根据文章“In 2017，the documentary Spy in the Wild gave us a chance to look much more closely into the world of animals through the eyes of ‘animal spies’．”和下句“They ‘live’ together with animals in order to record their lives．”可知段中应该有一个过渡句，C项符合题意，故选C。]
2．D [根据文章“Returning for its second season，Spy in the Wild follows the tradition of the first season while introducing new cameras and robots．”以及“For example，a spy turtle can lay robot eggs，a spy squirrel can gather robot nuts，and monkeys can play with a spy snowball．”可知，中间需要一个过渡句来顺承，所以D项符合，故选D。]
3．B [根据文章“In the new season，more than 50 spy robots are sent to study animals in all kinds of environments，from under the Pacific Ocean to the Arctic．”以及下文的They的回指，只有B和C选项涉及名词复数，C选项已经用过，所以B项符合题意，故选B。]
4．G [根据文章“For example，a spy penguin was accepted as part of a group in South Georgia Island．”以及后文“Quite accidentally，our spy creature is at the center of something special，capturing emotions that have seldom been watched”可知应该有一个过渡句，所以选G。]
5．F [根据文章“‘The whole point is ．．．trying to get closer than we ever have before to capture those elusive moments when they start to show the kind of emotions we have，’director John Downer told PBS．”可知，设空处应该是考查段落主旨大意，故F项符合题意，故选F。]
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