(共37张PPT)
Period 4
UNIT 4 SPACE EXPLORATION
主题语境
人与自然——地球与宇宙奥秘探索
课时学案 单元语法讲练(Discovering Useful Structures)
(1)(a) lack of 没有，缺乏；不足，不够
for lack of 因缺乏/缺少/没有……
(2)lack sth． 缺乏某物
(3)lacking adj． 缺少的，不足的
be lacking in... 在……方面缺乏
lack n．缺乏；短缺 vt．没有；缺乏
[即学即练]——单句语法填空/一句多译
①There is __ serious lack of insight into the problem．
②I must work hard in the hope of making up for lack ___ ability．
③由于缺乏烹饪经验，这对双胞胎把厨房弄得乱七八糟。
a．___________________________，the twins made the kitchen in a mess．(lack n．)
b．Because the twins ______________________，they made the kitchen in a mess．(lack v．)
c．Because the twins _____________________________，they made the kitchen in a mess．(lacking adj．)
a
of
For lack of cooking experience
lacked cooking experience
were lacking in cooking experience
动词不定式作定语和状语
动词不定式是非谓语动词的一种形式，其结构是“to＋动词原形”，否定形式为“not＋to＋动词原形”。动词不定式在句中不充当谓语，不受主语的限制，但有时态和语态的变化。动词不定式具有动词的特点，可以带有自己的宾语和状语。
动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语和宾语补足语等多种成分。
一、不定式作定语
不定式作定语需要后置，即放在被修饰的名词或代词后。它通常有以下用法：
1．不定式所修饰的名词可以是人或物，不定式与被修饰词之间有逻辑上的主谓关系或动宾关系。若存在动宾关系，且不定式中的动词是不及物的，其后则需要加上适当的介词。
The next train to arrive(＝that would arrive) was from New York．
下一列到站的火车是从纽约开来的。
I have nothing to say(＝that I must say) on this question．
在这个问题上，我没什么话要说。
There is nothing for us to worry about．
没有什么值得我们担忧的。
[名师点津] 有时，不定式中的动词尽管是及物的，并且已带了宾语，后面还要加一个适当的介词。
Let's first find a room to put the things in．
咱们先找到一个房间把东西放进去。
2．很多抽象名词后也可用不定式作定语，常见的有：way，time，reason，courage，chance，opportunity，need，drive，determination，decision，wish，effort，promise，ambition，desire，tendency，struggle，intention等。
I have enough time to go shopping with you．
我有足够的时间和你一起购物。
They have an opportunity to go abroad to study further now．
他们现在有一个出国深造的机会。
We must have the courage to admit our mistakes．
我们必须有承认自己错误的勇气。
Could you come up with some ways to solve air pollution
你能提出一些解决空气污染问题的方法吗？
[即时训练1] 单句语法填空
①In many homes in the UK，the first person _______ (wake) up has to make tea for the family．
②The airport _______________ (complete) next year will help promote tourism in this area．
③The best way __________ (improve) your English is to join an English club．
④Carol was happy that she had the chance ____________ (experience) the life in the city．
to wake
to be completed
to improve
to experience
二、不定式作状语
不定式作状语表示目的、原因、结果等，位置一般在句末或句首，句子的主语通常就是不定式的逻辑主语。
1．表示目的。不定式表目的是其作状语时最重要的用法。
We waved flags，beat drums and blew bugles to encourage the players．
我们摇旗、擂鼓、吹号来鼓励运动员。
They went to the US not to study English but to study law and business．
他们去了美国，不是为了学英语，而是为了学法律和商务。
[名师点津] (1)有时为了特别强调目的状语，可以在不定式之前加上in order或so as，即构成in order to do sth．和so as to do sth．结构。
In order to get a good seat，she arrived very early．
她到得很早，为的就是得到一个好座位。
I left a message so as to/in order to be sure of contacting her．
我留下一张便条以便确保能与她取得联系。
(2)in order to引导的目的状语，可以位于句首或句中，而so as to引导的目的状语，只位于句中。
(3)不定式的逻辑主语还可以是for后面的名词或代词。
He opened the door for the children to come in．
他打开门，为的是让孩子们进来。
(4)不定式的逻辑主语是谓语动词后的宾语。
They sent a man to mend the window．
他们派了一个人来修窗户。
2．表示原因。不定式作原因状语主要用于某些“be＋形容词＋不定式”结构。
常见的这类形容词有：happy，lucky，fortunate，unfortunate，ready，considerate，amazed，angry，anxious，astonished，delighted，disappointed，determined，frightened，glad，pleased，proud，shocked，sorry，surprised，willing等。
He was glad to be home again．
再次回到家里，他感到高兴。
We are proud to be young people of China．
作为中国青年我们感到自豪。
[名师点津] 在“be＋形容词＋不定式”结构中还可以用easy，hard，difficult，comfortable，pleasant等形容词，句子的主语除了表示人的词以外，还可以是表示事物的词。
Alice is easy to get along with．
爱丽丝很容易相处。
The problem is very difficult to solve．
这个问题很难处理。
The water in this well is not fit to drink．
这口井里的水不适合喝。
3．表示结果。
(1)不定式用作结果状语通常放在句末。
What have I said to make you so excited
我说了什么话让你如此激动？
(2)不定式作结果状语常用于“so ...as to ...，such ...as to ...，enough to ...，only to ...以及too ...to ...”结构中。
The house is so high and narrow as to resemble a tower．
这栋房子又高又窄，像一座塔。
Is this bridge strong enough to support heavy lorries
这座桥足够坚固来支撑重型卡车吗？
I arrived at the shop only to find I'd left all my money at home．
我到了商店才发现我把我的钱全落在家里了。
As a conductor he is too experienced to mind what the critics say．
他是一位经验非常丰富的指挥家，根本不会在乎那些评论家的话语。
[名师点津] only，never后接不定式表示一种出乎意料的结果。
They finally arrived at the airport，only to be told that the flight had been cancelled．
他们终于到达了机场，却被告知航班已经被取消了。
Robert ran away from home on a rainy night，never to return．
罗伯特在一个雨夜离家出走，再也没有回来。
[即时训练2] 单句语法填空
①________ (learn) more about Chinese culture，Jack has decided to take Chinese folk music as an elective course．
②We travel on Day 2 to northern France ________(visit) the World War Ⅰ battlefields．
③When the gorillas and I frightened each other，I was just glad _______ (find) them alive．
④Would you be so kind as ________ (spare) some time to come and join us
To learn
to visit
to find
to spare
用所给词的适当形式填空
Last weekend，I went to a bookstore 1．_______(buy) some books．There I came across a boy．He was old enough 2． ________ (read) by himself．He wanted to buy a geography book that cost one dollar．However，he had only sixty-two cents in his pocket．The money was too little for him 3．______ (get) that book．The boy looked quite disappointed，but he was determined 4．_______ (try) some other bookstores to get one．Because I wanted to know the result，I decided 5．_________ (follow) him．
to buy
to read
to get
to try
to follow
The boy tried four different bookstores 6．_______ (find) a cheaper book，but he went from one store to another only 7．_______ (find) the book more expensive．In the sixth bookstore，the owner found that the boy was worried，so he asked him why he was anxious 8．______ (get) a geography book．The boy told him that he wanted to become a sailor like his father．He wanted to learn more about geography． 9．______
____________(hear) what the boy said，the owner gave him one for free．The boy was very excited．The result was satisfying．Before I left，I gave the boy two dollars so that he was able to have money 10．_______ (buy) more books．
to find
to find
to get
Having
heard/Hearing
to buy
①globe n．地球；世界；地球仪
②billions of 数十亿
③much further away 更遥远
④argue vt．& vi．论证；争辩；争论
argument n．争论；争吵；论点
课下预习 第二篇课文(Reading for Writing)
⑤waste time and money doing sth．浪费时间和金钱做某事
⑥fatal adj．致命的；灾难性的
fatal diseases 致命疾病
⑦shallow adj．肤浅的；浅的
a shallow view 一个肤浅的观点
⑧make a difference 起作用；有影响
⑨result in 导致；造成
⑩a number of 许多的；大量的
pattern n．模式；图案；模范
weather patterns 天气模式
analysis n．(pl．analyses) (对事物的)分析；分析结果
after careful analysis 经过仔细的分析
as a result 所以；结果(是)
high-end adj．高端的
high-end products 高端产品
because of advanced technology 因为先进的技术
meet the requirements for 满足……需求
different types of 不同类型的……
monitor n．监视器；监测仪vt．监视；监测；监控
heart monitors 心脏监护仪
regularly adv．经常；定期地
regular adj．定期的；经常的；正常的
foam n．泡沫橡胶；泡沫
pillow n．枕头
memory foam pillows 记忆泡沫枕头
smartphone n．智能手机
smartphone cameras 智能手机相机
resource n．资源；财力；物力
limited adj．有限的
provide for sb．供应某人所需
at present 目前
be close to 离……近
closing adj．结尾的；结束的n．停业；关闭；倒闭
in closing 最后
so as to 为了
short-term and long-term problems 短期和长期问题
IS EXPLORING SPACE A WASTE OF TIME AND MONEY
Countries around the globe①are spending billions of②dollars and lots of time on various space missions，whether to Mars or other planets much further away③．Some people argue④ that we should stop wasting time and money exploring⑤space．[1] Instead，we should feed the world's poor and find immediate solutions to other problems，such as pollution and fatal⑥ diseases．However，others feel this is a shallow⑦view which fails to realise how exploring space helps us．[2]
[1]该句中that引导宾语从句。
[2]该句中feel后是省略了that的宾语从句，which引导定语从句，修饰先行词view。
Firstly，exploring space has already made a difference⑧ in the fight against world hunger．It has directly resulted in⑨ the many satellites that now orbit Earth．A number of⑩ the satellites record data on land and weather patterns ．Then the data is transmitted to scientists on Earth．After careful analysis ，the scientists can provide useful recommendations and advice for farmers．As a result ，space-based science has helped farming in its efforts to grow enough food to feed Earth's increasing population．[3]
［3］该句中to feed…作目的状语。
Secondly，space exploration has already promoted technological improvements that benefit us all．High-end products around the world are made to a higher standard now because of advanced technology which was first created to meet the requirements for space exploration．[4] For example，space technologies have helped the research and development of different types of new material．They have also helped companies make better heart monitors and other machines that doctors regularly use．Today，space technologies are widely used in all kinds of industries，and everyday products，such as memory foam pillows and smartphone cameras，are changing our lives．
[4]该句中which引导定语从句，修饰先行词technology。
Finally，sending astronauts into space has helped people to think about the world's problems and even to find ways to solve them．Seeing pictures of our planet as an island in a black sea made people realise that our planet's resources are limited ．[5] In order to provide for such a rapidly increasing population，scientists are trying to find other planets that could one day be our new home．The greatest attention at present is on Mars because it is closer to Earth．In the future，humans may live on both planets．
[5]该句中Seeing pictures of our planet as an island in a black sea作主语，that引导宾语从句。
In closing ，exploring space provides the world with many different benefits．Therefore，it should continue so as to provide new and better solutions to people's short-term and long-term problems ．
探索太空是否浪费时间和金钱？
无论是去火星还是其他更遥远的星球，世界各国都在花费数十亿美元和大量时间在各种太空使命上。有人认为我们应该停止浪费时间和金钱来探索太空。相反，我们应该为世界上的穷人提供食物，并立即解决其他问题，例如污染和致命疾病。然而，其他人则认为这是一个肤浅的观点，没有意识到探索太空对我们的帮助。
首先，探索太空在消除世界饥饿的斗争中发挥了作用。它直接影响现在绕地球飞行的许多卫星。许多卫星记录着陆地和天气模式的数据。然后，这些数据被传送到地球上的科学家手里。经过仔细分析，科学家们可以为农民提供有用的建议。因此，太空技术帮助农业努力种植足够的食物来养活地球上不断增长的人口。
其次，太空探索促进了造福于我们所有人的技术进步。由于先进的技术首先被发明来满足太空探索的需求，因此现在世界各地的高端产品都达到了更高的标准。例如，太空技术有助于研究和开发不同类型的新材料。它们还帮助公司制造了更好的心脏监护仪和医生经常使用的其他仪器。如今，太空技术已广泛应用于各个行业，并且诸如记忆泡沫枕头和智能手机相机之类的日常用品正在改变我们的生活。
最后，将宇航员送入太空帮助人们思考世界上的问题，甚至找到了解决问题的方法。看着我们星球的照片，犹如黑色汪洋大海中的一个小岛，人们意识到地球的资源是有限的。为了满足如此迅速增长的人口，科学家们正在努力寻找将来可能成为我们新家园的其他行星。目前最受关注的是火星，因为它离地球更近。在未来，人类可能生活在两个星球上。
最后，探索太空为世界带来许多不同的好处。因此，它应该继续下去，以便为人们的短期和长期问题提供新的和更好的解决方案。
THANKSPeriod 4 单元语法讲练(Discovering Useful Structures)
lack n．缺乏；短缺 vt．没有；缺乏
(1)(a) lack of 没有，缺乏；不足，不够
for lack of 因缺乏/缺少/没有……
(2)lack sth． 缺乏某物
(3)lacking adj． 缺少的，不足的
be lacking in... 在……方面缺乏
[即学即练]——单句语法填空/一句多译
①There is serious lack of insight into the problem．
②I must work hard in the hope of making up for lack ability．
③由于缺乏烹饪经验，这对双胞胎把厨房弄得乱七八糟。
a． ，the twins made the kitchen in a mess．(lack n．)
b．Because the twins ，they made the kitchen in a mess．(lack v．)
c．Because the twins ，they made the kitchen in a mess．(lacking adj．)
动词不定式作定语和状语
动词不定式是非谓语动词的一种形式，其结构是“to＋动词原形”，否定形式为“not＋to＋动词原形”。动词不定式在句中不充当谓语，不受主语的限制，但有时态和语态的变化。动词不定式具有动词的特点，可以带有自己的宾语和状语。
动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语和宾语补足语等多种成分。
一、不定式作定语
不定式作定语需要后置，即放在被修饰的名词或代词后。它通常有以下用法：
1．不定式所修饰的名词可以是人或物，不定式与被修饰词之间有逻辑上的主谓关系或动宾关系。若存在动宾关系，且不定式中的动词是不及物的，其后则需要加上适当的介词。
The next train to arrive(＝that would arrive) was from New York．
下一列到站的火车是从纽约开来的。
I have nothing to say(＝that I must say) on this question．
在这个问题上，我没什么话要说。
There is nothing for us to worry about．
没有什么值得我们担忧的。
[名师点津] 有时，不定式中的动词尽管是及物的，并且已带了宾语，后面还要加一个适当的介词。
Let's first find a room to put the things in．
咱们先找到一个房间把东西放进去。
2．很多抽象名词后也可用不定式作定语，常见的有：way，time，reason，courage，chance，opportunity，need，drive，determination，decision，wish，effort，promise，ambition，desire，tendency，struggle，intention等。
I have enough time to go shopping with you．
我有足够的时间和你一起购物。
They have an opportunity to go abroad to study further now．
他们现在有一个出国深造的机会。
We must have the courage to admit our mistakes．
我们必须有承认自己错误的勇气。
Could you come up with some ways to solve air pollution
你能提出一些解决空气污染问题的方法吗？
[即时训练1] 单句语法填空
①In many homes in the UK，the first person (wake) up has to make tea for the family．
②The airport (complete) next year will help promote tourism in this area．
③The best way (improve) your English is to join an English club．
④Carol was happy that she had the chance (experience) the life in the city．
二、不定式作状语
不定式作状语表示目的、原因、结果等，位置一般在句末或句首，句子的主语通常就是不定式的逻辑主语。
1．表示目的。不定式表目的是其作状语时最重要的用法。
We waved flags，beat drums and blew bugles to encourage the players．
我们摇旗、擂鼓、吹号来鼓励运动员。
They went to the US not to study English but to study law and business．
他们去了美国，不是为了学英语，而是为了学法律和商务。
[名师点津] (1)有时为了特别强调目的状语，可以在不定式之前加上in order或so as，即构成in order to do sth．和so as to do sth．结构。
In order to get a good seat，she arrived very early．
她到得很早，为的就是得到一个好座位。
I left a message so as to/in order to be sure of contacting her．
我留下一张便条以便确保能与她取得联系。
(2)in order to引导的目的状语，可以位于句首或句中，而so as to引导的目的状语，只位于句中。
(3)不定式的逻辑主语还可以是for后面的名词或代词。
He opened the door for the children to come in．
他打开门，为的是让孩子们进来。
(4)不定式的逻辑主语是谓语动词后的宾语。
They sent a man to mend the window．
他们派了一个人来修窗户。
2．表示原因。不定式作原因状语主要用于某些“be＋形容词＋不定式”结构。
常见的这类形容词有：happy，lucky，fortunate，unfortunate，ready，considerate，amazed，angry，anxious，astonished，delighted，disappointed，determined，frightened，glad，pleased，proud，shocked，sorry，surprised，willing等。
He was glad to be home again．
再次回到家里，他感到高兴。
We are proud to be young people of China．
作为中国青年我们感到自豪。
[名师点津] 在“be＋形容词＋不定式”结构中还可以用easy，hard，difficult，comfortable，pleasant等形容词，句子的主语除了表示人的词以外，还可以是表示事物的词。
Alice is easy to get along with．
爱丽丝很容易相处。
The problem is very difficult to solve．
这个问题很难处理。
The water in this well is not fit to drink．
这口井里的水不适合喝。
3．表示结果。
(1)不定式用作结果状语通常放在句末。
What have I said to make you so excited
我说了什么话让你如此激动？
(2)不定式作结果状语常用于“so...as to...，such ...as to ...，enough to ...，only to ...以及too ...to ...”结构中。
The house is so high and narrow as to resemble a tower．
这栋房子又高又窄，像一座塔。
Is this bridge strong enough to support heavy lorries
这座桥足够坚固来支撑重型卡车吗？
I arrived at the shop only to find I'd left all my money at home．
我到了商店才发现我把我的钱全落在家里了。
As a conductor he is too experienced to mind what the critics say．
他是一位经验非常丰富的指挥家，根本不会在乎那些评论家的话语。
[名师点津] only，never后接不定式表示一种出乎意料的结果。
They finally arrived at the airport，only to be told that the flight had been cancelled．
他们终于到达了机场，却被告知航班已经被取消了。
Robert ran away from home on a rainy night，never to return．
罗伯特在一个雨夜离家出走，再也没有回来。
[即时训练2] 单句语法填空
① (learn) more about Chinese culture，Jack has decided to take Chinese folk music as an elective course．
②We travel on Day 2 to northern France (visit) the World War Ⅰ battlefields．
③When the gorillas and I frightened each other，I was just glad (find) them alive．
④Would you be so kind as (spare) some time to come and join us
用所给词的适当形式填空
Last weekend，I went to a bookstore 1． (buy) some books．There I came across a boy．He was old enough 2． (read) by himself．He wanted to buy a geography book that cost one dollar．However，he had only sixty-two cents in his pocket．The money was too little for him 3． (get) that book．The boy looked quite disappointed，but he was determined 4． (try) some other bookstores to get one．Because I wanted to know the result，I decided 5． (follow) him．
The boy tried four different bookstores 6． (find) a cheaper book，but he went from one store to another only 7． (find) the book more expensive．In the sixth bookstore，the owner found that the boy was worried，so he asked him why he was anxious 8． (get) a geography book．The boy told him that he wanted to become a sailor like his father．He wanted to learn more about geography．9． (hear) what the boy said，the owner gave him one for free．The boy was very excited．The result was satisfying．Before I left，I gave the boy two dollars so that he was able to have money 10． (buy) more books．
第二篇课文(Reading for Writing)
①globe n．地球；世界；地球仪
②billions of数十亿
③much further away更遥远
④argue vt．& vi．论证；争辩；争论
argument n．争论；争吵；论点
⑤waste time and money doing sth．浪费时间和金钱做某事
⑥fatal adj．致命的；灾难性的
fatal diseases致命疾病
⑦shallow adj．肤浅的；浅的
a shallow view一个肤浅的观点
⑧make a difference起作用；有影响
⑨result in 导致；造成
⑩a number of许多的；大量的
pattern n．模式；图案；模范
weather patterns天气模式
analysis n．(pl．analyses) (对事物的)分析；分析结果
after careful analysis经过仔细的分析
as a result 所以；结果(是)
high-end adj．高端的
high-end products高端产品
because of advanced technology因为先进的技术
meet the requirements for满足……需求
different types of不同类型的……
monitor n．监视器；监测仪vt．监视；监测；监控
heart monitors心脏监护仪
regularly adv．经常；定期地
regular adj．定期的；经常的；正常的
foam n．泡沫橡胶；泡沫
pillow n．枕头
memory foam pillows记忆泡沫枕头
smartphone n．智能手机
smartphone cameras智能手机相机
resource n．资源；财力；物力
limited adj．有限的
provide for sb．供应某人所需
at present目前
be close to离……近
closing adj．结尾的；结束的n．停业；关闭；倒闭
in closing 最后
so as to为了
short-term and long-term problems短期和长期问题
IS EXPLORING SPACE A WASTE OF TIME AND MONEY
Countries around the globe①are spending billions of②dollars and lots of time on various space missions，whether to Mars or other planets much further away③．Some people argue④ that we should stop wasting time and money exploring⑤space．[1] Instead，we should feed the world's poor and find immediate solutions to other problems，such as pollution and fatal⑥ diseases．However，others feel this is a shallow⑦view which fails to realise how exploring space helps us．[2]
[1]该句中that引导宾语从句。
[2]该句中feel后是省略了that的宾语从句，which引导定语从句，修饰先行词view。
Firstly，exploring space has already made a difference⑧ in the fight against world hunger．It has directly resulted in⑨ the many satellites that now orbit Earth．A number of⑩ the satellites record data on land and weather patterns ．Then the data is transmitted to scientists on Earth．After careful analysis ，the scientists can provide useful recommendations and advice for farmers．As a result ，space-based science has helped farming in its efforts to grow enough food to feed Earth's increasing population．[3]
[3]该句中to feed...作目的状语。
Secondly，space exploration has already promoted technological improvements that benefit us all．High-end products around the world are made to a higher standard now because of advanced technology which was first created to meet the requirements for space exploration．[4] For example，space technologies have helped the research and development of different types of new material．They have also helped companies make better heart monitors and other machines that doctors regularly use．Today，space technologies are widely used in all kinds of industries，and everyday products，such as memory foam pillows and smartphone cameras，are changing our lives．
[4]该句中which引导定语从句，修饰先行词technology。
Finally，sending astronauts into space has helped people to think about the world's problems and even to find ways to solve them．Seeing pictures of our planet as an island in a black sea made people realise that our planet's resources are limited ．[5] In order to provide for such a rapidly increasing population，scientists are trying to find other planets that could one day be our new home．The greatest attention at present is on Mars because it is closer to Earth．In the future，humans may live on both planets．
[5]该句中Seeing pictures of our planet as an island in a black sea作主语，that引导宾语从句。
In closing ，exploring space provides the world with many different benefits．Therefore，it should continue so as to provide new and better solutions to people's short-term and long-term problems ．
探索太空是否浪费时间和金钱？
无论是去火星还是其他更遥远的星球，世界各国都在花费数十亿美元和大量时间在各种太空使命上。有人认为我们应该停止浪费时间和金钱来探索太空。相反，我们应该为世界上的穷人提供食物，并立即解决其他问题，例如污染和致命疾病。然而，其他人则认为这是一个肤浅的观点，没有意识到探索太空对我们的帮助。
首先，探索太空在消除世界饥饿的斗争中发挥了作用。它直接影响现在绕地球飞行的许多卫星。许多卫星记录着陆地和天气模式的数据。然后，这些数据被传送到地球上的科学家手里。经过仔细分析，科学家们可以为农民提供有用的建议。因此，太空技术帮助农业努力种植足够的食物来养活地球上不断增长的人口。
其次，太空探索促进了造福于我们所有人的技术进步。由于先进的技术首先被发明来满足太空探索的需求，因此现在世界各地的高端产品都达到了更高的标准。例如，太空技术有助于研究和开发不同类型的新材料。它们还帮助公司制造了更好的心脏监护仪和医生经常使用的其他仪器。如今，太空技术已广泛应用于各个行业，并且诸如记忆泡沫枕头和智能手机相机之类的日常用品正在改变我们的生活。
最后，将宇航员送入太空帮助人们思考世界上的问题，甚至找到了解决问题的方法。看着我们星球的照片，犹如黑色汪洋大海中的一个小岛，人们意识到地球的资源是有限的。为了满足如此迅速增长的人口，科学家们正在努力寻找将来可能成为我们新家园的其他行星。目前最受关注的是火星，因为它离地球更近。在未来，人类可能生活在两个星球上。
最后，探索太空为世界带来许多不同的好处。因此，它应该继续下去，以便为人们的短期和长期问题提供新的和更好的解决方案。
Period 4
核心词汇
①a ②of ③For lack of cooking experience；lacked cooking experience；were lacking in cooking experience
单元语法
[即时训练1]
①to wake ②to be completed ③to improve
④to experience
[即时训练2]
①To learn ②to visit ③to find ④to spare
巩固落实
1．to buy 2．to read 3．to get 4．to try 5．to follow
6．to find 7．to find 8．to get 9．Having heard/Hearing
10．to buy
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