資源簡介

【暑假闖關集訓】復習Unit6
一、單項選擇
1．You need to ________ on the computer before you start working.
A．power B．take C．put D．get
2．Wearing seat belts in cars is very important for our ________.
A．health B．safety C．happiness D．beauty
3．You ________ play with fire. It’s very dangerous.
A．mustn’t B．needn’t C．may not D．don’t have to
4．The ground is wet. There _________.
A．maybe rain B．maybe rainy C．may be rainy D．may be rain
5．She ________ because she wants to buy electricity in packets like sweets.
A．smells well B．looks foolish C．feels bad D．tastes bad
6．My teacher gave me a difficult math ________ to finish during the weekend. It was much harder than the usual class ________.
A．task; work B．work; task C．job; task D．task; job
7．The car was moving at a very high ________. We were all worried.
A．speed B．height C．weight D．price
8．The Internet ________ people all over the world. We can share information easily.
A．separates B．divides C．connects D．breaks
9．In modern society, many people only seem to ________ making money. They forget the importance of family.
A．care about B．think over C．look for D．get over
10．Monkey King is one of very famous symbols in Chinese ______ .
A．advice B．rule C．order D．culture
二、完成句子
11．氣候變化影響我們的星球，所以我們應該現在采取行動。
affects our planet, so we should now.
12．他駕駛著電動汽車以每小時100公里的速度行駛。
He is driving an electric car 100 kilometers per hour.
13．我們不得不用手洗所有的衣服，這花了我們很多時間。
We wash all our clothes , and this us a lot of time.
14．我們可以用水、風還有陽光來發電。
We can use water, wind and sunlight to .
15．現如今，孩子們喜歡在家玩電子游戲。
At present, children like at home.
16．昨天我的錢用完了。
I my money yesterday.
17．我們一定要小心用電。
We with electricity.
三、語法選擇
In the early 1800s, the first electric light was made. But there was no good way to get electricity into homes. Two men began working to develop 18 electric generator (發電機). One was the famous Thomas Edison. 19 was a young man 20 Nikola Testa.
Testa was born in Croatia in 1856 and moved to America in 1884. He 21 Thomas Edison and worked with him in Edison’s company. Edison had developed a generator that made direct current-DC (直流電). His generator already 22 light a small area of New York City. Testa helped Edison 23 his DC generator better. But he did not stay with Edison very long. Testa thought there was a better way of 24 electricity.
Nikola Testa knew more about electricity than almost anyone. Testa did not invent the AC generator. 25 he believed alternating current-AC (交流電), was 26 way to power homes.
He went to work 27 a large electric company. He developed AC generators to power homes and businesses. Tesla was on his way to great 28 .
Edison fought against Tesla’s AC generators because he was not happy. He told everyone that AC would kill people. It was true that AC was 29 than DC． But DC had 30 own problems. It could not be sent far from the generator. AC, on the other hand, could be sent very far. Finally Nikola Tesla was a great 31 , and 32 his inventions, now the whole world has electricity.
18．A．a B．an C．the D．\
19．A．others B．the other C．other D．another
20．A．name B．named C．names D．naming
21．A．join B．joins C．joined D．joining
22．A．may B．must C．should D．could
23．A．makes B．made C．make D．making
24．A．producing B．produce C．produced D．produces
25．A．and B．but C．or D．so
26．A．good B．better C．best D．the best
27．A．at B．on C．for D．to
28．A．success B．succeed C．successful D．successfully
29．A．dangerous B．much dangerous C．more dangerous D．the most dangerous
30．A．it B．it’s C．its D．its’
31．A．invent B．invention C．inventer D．inventor
32．A．because B．because of C．because for D．because to
四、完形填空
Electricity is very useful for us. It plays a very 33 role in our life today. It can bring us light, heat and so on. We cannot live without it. It 34 our lives. So how can we use electricity 35 First, we must be 36 with it and can’t put the electrical appliance near the fire. Then, we can’t also 37 it with wet hands because we may get an electric shock (電擊). It is very 38 .
In our country, we have used electricity for many 39 . It is a long time. But we have to know, at the same time, we waste a large part of it. Producing it also 40 the environment around us. As a student, we should use the air conditioner less often and turn off the lights when we leave the room and not sleep with the lights on. As a 41 goes, “Actions speak louder than words.” Please 42 in the action to save electricity from now on.
33．A．interesting B．important C．useless D．active
34．A．changes B．returns C．ends D．starts
35．A．quickly B．slowly C．safely D．easily
36．A．careful B．useful C．hopeful D．helpful
37．A．leave B．touch C．throw D．eat
38．A．difficult B．strong C．dangerous D．delicious
39．A．days B．weeks C．months D．years
40．A．protects B．saves C．pollutes D．improves
41．A．saying B．hearing C．feeling D．thinking
42．A．meet B．arrive C．connect D．join
五、閱讀理解
A
What would you like for lunch Maybe, a battery (電池) Although it sounds unusual, this has already been realized by scientists as they develop electronic things you can eat.
Robofood, led by Dario Floreano from a Swiss Institute, has created a new drone (無人機) with scientists from Wageningen University, the Netherlands. Half of the parts inside can be eaten! The program aims to (旨在) make robots that can be eaten and foods that act like robots by mixing food science and robots in a new way.
The drone’s wings are made from rice cakes glued together with oil and chocolate. It can find missing people or animals in emergencies (緊急情況) and send food or medicine. Parts of the drone can be eaten because they meet food safety standards for emergencies set by the United Nations.
However, the main challenge is finding stronger edible (可食用的) materials for the drone’s wings to prepare for bad weather and high temperatures—of course, the chocolate may melt (融化) easily.
Robofood also developed an edible sensor (感應器) to help monitor (監控) stomach sickness. It’s eaten by the patient to check the conditions inside. It’s different from other sensors because it’s easy for your body to digest (消化), so it won’t leave any remains inside the body.
The invention of Robofood also helps with environmental protection. There are batteries that you can fully eat. They are made from natural things like vitamin B2 and elements (元素) found in fruits. This helps the environment because you won’t have to throw them away like other batteries.
43．What is Robofood’s main goal
A．To develop smart drones. B．To create edible electronics.
C．To help check stomach disease. D．To put sensors on drones.
44．What problem does Robofood’s drone have
A．The drone can easily break during flying.
B．The drone cannot take off in bad weather.
C．The materials are not strong enough.
D．The materials cannot easily melt.
45．Compared to other sensors for checking the stomach, Robofood’s sensors _____.
A．can be safer for health B．can check more carefully
C．can stay in the human body longer D．can be taken as medicine
46．Why is Robofood’s battery good for nature
A．It uses less power. B．It cuts down pollution.
C．It uses solar power. D．It is made from food waste.
47．Which of the following best describes the main idea of the passage
A．Robots can help people in emergencies by sending food and medicine.
B．Edible batteries are invented to protect the environment.
C．Scientists from different countries work together to develop new technology.
D．Robofood creates new robots and sensors that are mainly made of edible materials.
B
It’s there, but it has no weight, no colour, and you can’t smell it. You can’t see it, but it’s working everywhere in our modern world. Don’t try to touch it! It’s dangerous. It has always existed, but humans learned about it only 500 years ago.
What is it Electricity. It’s powerful and mysterious. Thanks to electricity, you can flick a switch (開關) and have light. Watched a good TV show lately You couldn’t do that without electricity. We cook our food, heat our homes and run our computers using electricity. But what is it, really
Here is a simple description. Everything in the world is made of atoms (原子). Atoms are small. You can fit millions of them on the head of a pin. In every atom, there are electrons (電子), protons (質子) and neutrons (中子). In some atoms, it is possible to move electrons easily from one atom to another. As the electrons move, a current (電流) is created. This is electricity.
Don’t worry if you don’t understand it fully. Just remember that electricity is the result of the movement of electrons. As the electrons move, they create a strong electric charge.
There are many ways to generate electricity. A machine called a generator spins (旋轉) rapidly. Water and wind can make a generator spin. So can motors fuelled by oil. As the generator spins, the electrons begin to move. As they move, they create an electric current. Power lines (電線) are built from generators to carry this current to places where people can use it. Along your street, power lines bring electricity right to your door. A wire runs into your house. More wires inside your house are attached to the plugs. Plug in your lamp, the electricity lights up the bulb, and you have light!
It takes a lot of energy to make electricity. Oil is one of the main fuels (燃料) used to power electric generators. Another common fuel is coal. Our planet is running out of these resources, and using them creates a lot of pollution.
In the future, most electricity will be produced using the sun and wind. But for now, be careful about how much electricity you use. Don’t forget to turn off the lights when you leave a room. Every little bit helps.
48．The writer mentions atoms in the third paragraph to ________.
A．show the relationship between electricity and atoms
B．explain what the electricity is
C．tell us everything in the world is made of atoms
D．describe how the electrons move
49．What can we know about the discovery of electricity from the passage
A．It was accidentally found by scientists 500 years ago.
B．Humans always knew about electricity but couldn’t use it.
C．Its existence was recognized relatively recently in history.
D．Electricity became widely used immediately after its discovery.
50．Why does the author explain the structure of atoms in the passage
A．To prove that atoms are the smallest particles in the universe.
B．To show the relationship between electron movement and electricity.
C．To explain why some atoms are more dangerous than others.
D．To compare the functions of electrons, protons, and neutrons.
51．What problem with current electricity production does the author mean
A．Generators are too expensive to build and maintain.
B．Renewable energy sources are not yet available.
C．Dependence on oil and coal causes environmental issues.
D．The demand for electricity exceeds the supply worldwide.
52．What might be the best title for the passage
A．How to make electricity. B．How electricity helps us.
C．Electricity—A Natural Force. D．Save the energy; Save the world.
C
Electricity is an important part in our life. We can’t see or touch it, but it is all around us. 53 But some people don’t know that everyone should save electricity. When it is not completely dark, many street lamps (路燈) light up early in some streets of places. 54 Some people are sleeping with the lights on. They are all wrong. Here I make some suggestions about stopping these things.
1. 55 We light them from 7:00 p.m.—5:30 a.m. in summer, and from 5:30 p.m.—6:00 a.m. in winter.
2. If some small areas are very dark, just turn on a few lights.
3. The distance (距離) between street lamps can be 50—60 meters. 56
4. If there are some activities, we can make the lights bright, if there is no activity, lights needn’t be too bright.
5. Ask people to save electricity through TV shows, newspapers, and so on.
Electricity is a valuable resource (資源). It helps us live well and conveniently. 57
A．Our life will be terrible without electricity.
B．It can save electricity and money.
C．Turn on the street lamps on time.
D．Some people don’t turn off the lights when they leave the room.
E．We should take action to save it at once!
六、短文填空
閱讀短文，根據上下文和所給的首字母寫出所缺單詞。注意使用正確形式，每空限填一詞。
In order to protect our Earth, people set up Earth Hour. It s 58 on 31 March in 2007. And now it is always on the last Saturday of March every year. On this day, millions of people will s 59 off their lights, staying in darkness for one hour. Some of them also give up using other electrical appliances, for e 60 , air conditioners, TVs, and computers. They do this to s 61 electricity.
Earth Hour is not only about cutting down the use of electricity, but also about showing care for our beautiful p 62 — the Earth. We share it with other animals and plants. We should protect it!
七、書面表達
63．你的老師 Miss Lin 要求你們以小組為單位寫一篇主題為保護動植物的倡議性文章，以下是你們小組成員的觀點，請根據以下表格要點提示，適當發揮完成作文。
Protect Man’s Best Friends
Jim 動物幫助我們做很多事，比如幫助盲人；
Anna 植物清新空氣，使生活更便利；
你的觀點 動物（請補充至少一個點） 植物（請補充至少一個點）
你們的倡議 倡議 1：停止砍伐樹木 倡議 2：請補充至少一個點
注意：作文必須包括表格所有信息；詞數：70 詞左右；不得透露學校、姓名等任何個人信息，否則不予評分。
Protect Man’s Best Friends
Animals and plants are our best friends. They help us a lot in our daily lives.
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/ 讓學習更有效 暑假打卡計劃 | 英語學科
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參考答案
1．A
【詳解】句意：在開始工作前，你需要打開電腦。
考查動詞短語辨析。power on打開 (電源)，啟動；take on承擔 (責任)，呈現 (面貌)；put on穿上，上演；get on上車，進展。根據“on the computer before you start working”可知，此處是指在開始工作前需要打開電腦。故選A。
2．B
【詳解】句意：系安全帶是為了保障我們在乘車時的安全。
考查名詞詞義辨析。health健康；safety安全；happiness幸福；beauty美麗。根據“Wearing seat belts in cars is very important for our...”與常識可知，系安全帶的目的是保障安全，故“safety”符合題意，故選B。
3．A
【詳解】句意：你不準玩火。它非常危險。
考查情態動詞的用法。mustn’t 不準；needn’t 不必；may not 可能不；don’t have to 不必。根據“It’s very dangerous”可知，玩火是非常危險的，因此應該不準玩火，故選A。
4．D
【詳解】句意：地面濕了。可能是下雨了。
考查情態動詞may的用法及There be句型。maybe是副詞，需修飾整個句子，不能直接與名詞rain或形容詞rainy連用，所以排除選項A和B；“There may be+名詞”表示“可能有某物”，所以空處應選may be rain。故選D。
5．B
【詳解】句意：她看起來很傻，因為她想像買糖果一樣成包地買電。
考查動詞短語辨析。smells well聞起來不錯；looks foolish看起來很傻；feels bad感覺不好；tastes bad味道不好。根據“she wants to buy electricity in packets like sweets”可推知，想像買糖果一樣成包地買電的人看起來很傻。故選B。
6．A
【詳解】句意：我的老師給了我一道很難的數學題，讓我在周末完成。它比平時的課堂作業難多了。
考查名詞辨析。task任務；work工作；job職業。task側重于被分配、指定去完成的具體事項，a difficult math task指具體的數學任務，符合語境；work作不可數名詞時，可表示“工作；活計”，class work是常見搭配，強調在課堂相關的學習任務；job是可數名詞，主要指一份職業、工作，用在此處不合適。故選A。
7．A
【詳解】句意：汽車正以很高的速度行駛。我們都很擔心。
考查名詞辨析。speed速度；height高度；weight重量；price價格。根據“The car was moving at a very high..., We were all worried.”可知，這里是說汽車的速度很快，讓人擔心。at a high speed“以很高的速度”，固定搭配。故選A。
8．C
【詳解】句意：互聯網把全世界的人們連接起來，使得我們能夠輕松地分享信息。
考查動詞辨析。separates分開；divides劃分；connect連接；breaks打破。根據“We can share information easily.”“可知，我們能夠輕松地分享信息，說明此處應該是“把全世界的人們連接起來”，connect符合語境，故選C。
9．A
【詳解】句意：在現代社會，許多人似乎只關心賺錢。他們忘記了家庭的重要性。
考查動詞短語詞義辨析。care about關心，在意；think over仔細考慮；look for尋找；get over克服，恢復。根據“many people only seem to...making money. They forget the importance of family.”可知，這里表達許多人只在乎賺錢，而忘記家庭重要性，care about符合語境。故選A。
10．D
【詳解】句意：孫悟空是中國文化中最著名的象征之一。
考查名詞辨析。advice建議；rule規則；order命令；culture文化。根據“Monkey King is one of very famous symbols”可知 ，孫悟空是中國文化中最著名的象征之一。故選D。
11． Climate change take action
【詳解】第一空：根據中英文對照，空格處缺“氣候變化”。英文對應“Climate change”；根據“affects”可知，此處填名詞單數；第二空：根據中英文對照，空格處缺“采取行動”。英文對應“take action”；“should”后填動詞原形。故填Climate；change；take；action。
12． at a speed of
【詳解】以……速度：at a spend of，介詞短語。故填at；a；speed；of。
13． had to by hand took
【詳解】對比中英文可知，空處缺少“不得不”、“用手”和“花了”；根據英文題干和漢語提示可知，此處考查have to“不得不”，句子陳述過去發生的事情，時態應用一般過去時，這里應用過去式had；by hand“用手”，介詞短語；take“花費”，動詞，這里應用過去式took。故填had；to；by；hand；took。
14． produce electricity
【詳解】根據中英文對照可知，英文句子缺少“發電”，英文表達是produce electricity，動詞produce位于動詞不定式符號to之后，所以produce保持原形。故填produce；electricity。
15． playing video games
【詳解】根據中英文對比可知，缺少“玩電子游戲”，英文表達為play video games；like doing sth.意為“喜歡做某事”，故填playing；video； games。
16． ran out of
【詳解】run out of sth.表示“用完了某物”，根據“yesterday”可知要用一般過去時，動詞應用過去式。故填ran；out；of。
17． must be careful
【詳解】根據中英文對照可知，句中缺少“一定小心”的英文內容，must“一定”，后接動詞原形，be careful“小心”。故填must；be；careful。
18．B 19．B 20．B 21．C 22．D 23．C 24．A 25．B 26．D 27．C 28．A 29．C 30．C 31．D 32．B
【導語】本文講述了19世紀初期，托馬斯·愛迪生和尼古拉·特斯拉在電力發展中的貢獻，特別是他們在直流電和交流電發電機方面的競爭與合作。
18．句意：兩個人開始研發一種發電機。
a一個；an一個；the這個；\無。根據“Two men began working to develop…electric generator”可知，這里指的是研發一種發電機，且“electric”以元音開頭，故選B。
19．句意：另一個人是一個叫尼古拉·特斯拉的年輕人。
others其他人；the other另一個；other其他的；another另一個。根據“One was the famous Thomas Edison…was a young man”可知，這里指的是兩個人中的另一個，故選B。
20．句意：另一個人是一個叫尼古拉·特斯拉的年輕人。
name名字，名詞；named名叫，過去分詞；names名字，名詞復數；naming命名，動名詞或現在分詞。根據“…was a young man…Nikola Testa”可知，這里指的是名叫尼古拉·特斯拉的年輕人，故選B。
21．句意：他加入了托馬斯·愛迪生，并在愛迪生的公司工作。
join加入，動詞原形；joins加入，三單形式；joined加入，過去式；joining加入，現在分詞或動名詞。根據“He…Thomas Edison and worked with him in Edison’s company”可知，這里指的是過去加入愛迪生，故選C。
22．句意：他的發電機已經能夠照亮紐約市的一小片區域。
may可能；must必須；should應該；could能夠。根據“His generator already…light a small area of New York City”可知，這里指的是發電機能夠照亮，故選D。
23．句意：特斯拉幫助愛迪生改進他的直流發電機。
makes制作，三單形式；made制作，過去式；make制作，動詞原形；making制作，現在分詞或動名詞。根據“Testa helped Edison…his DC generator better”可知，這里指的是幫助改進，help sb. do sth“幫助某人做某事”。故選C。
24．句意：特斯拉認為有一種更好的發電方式。
producing生產，現在分詞或動名詞；produce生產，動詞原形；produced生產，動詞過去式或過去分詞；produces生產，動詞三單形式。根據“Testa thought there was a better way of…electricity”可知，這里指的是發電的方式，介詞of后接動名詞。故選A。
25．句意：但他相信交流電是更好的供電方式。
and和；but但是；or或者；so所以。根據“Testa did not invent the AC generator…he believed alternating current-AC, was…way to power homes”可知，這里表示轉折，故選B。
26．句意：但他相信交流電是更好的供電方式。
good好；better更好；best最好；the best最好的。根據“he believed alternating current-AC, was…way to power homes”可知，這里指的是最好的給家庭供電的方式，故選D。
27．句意：他去了一家大型電力公司工作。
at在；on在；for為；to到。根據“He went to work…a large electric company”可知，這里指的是為一家大的電力公司工作，故選C。
28．句意：特斯拉正走向偉大的成功。
success成功，名詞；succeed成功，動詞；successful成功的，形容詞；successfully成功地，副詞。根據“Tesla was on his way to great…”可知，這里指的是成功，用名詞作賓語。故選A。
29．句意：交流電確實比直流電更危險。
dangerous危險的；much dangerous非常危險；more dangerous更危險；the most dangerous最危險。根據“It was true that AC was…than DC”可知，這里指的是更危險，than提示用比較級。故選C。
30．句意：但直流電也有它自己的問題。
it它；it’s它是；its它的；its’無此形式。根據“But DC had…own problems”可知，這里指的是直流電自己的問題，修飾名詞用形容詞。故選C。
31．句意：最終，尼古拉·特斯拉是一位偉大的發明家，因為他的發明，現在全世界都有了電。
invent發明，動詞；invention發明，名詞；inventer無此詞；inventor發明家。根據“Finally Nikola Tesla was a great…”可知，這里指的是發明家，故選D。
32．句意：最終，尼古拉·特斯拉是一位偉大的發明家，因為他的發明，現在全世界都有了電。
because因為；because of因為；because for無此用法；because to無此用法。根據“…his inventions, now the whole world has electricity”可知，這里指的是因為他的發明，后接名詞的是because of。故選B。
33．B 34．A 35．C 36．A 37．B 38．C 39．D 40．C 41．A 42．D
【導語】本文是一篇說明文。文章主要講了電對我們很有用，在生活中作用重大且改變了我們的生活，接著闡述安全用電的方法、我國用電時間長但存在浪費及污染環境問題，最后呼吁大家加入節約用電行動。
33．句意：如今，它在我們的生活中起著非常重要的作用。
interesting有趣的；important重要的；useless無用的；active積極的。結合前文“Electricity is very useful for us.”可知電在我們生活中起著重要作用，故選B。
34．句意：它改變了我們的生活。
changes改變；returns返回；ends結束；starts開始。電給我們帶來光、熱等，確實改變了我們的生活，故選A。
35．句意：那么我們如何安全地使用電呢？
quickly快速地；slowly緩慢地；safely安全地；easily容易地。后文提到不能把電器放在火旁等，都是在說安全用電，故選C。
36．句意：首先，我們必須小心使用電，不能把電器放在火的附近。
careful小心的；useful有用的；hopeful充滿希望的；helpful有幫助的。不能把電器放在火旁，說明要小心用電，故選A。
37．句意：然后，我們也不能用濕手觸摸電器，因為我們可能會觸電。
leave離開；touch觸摸；throw扔；eat吃。我們不能用濕手觸摸電器，否則可能觸電。故選B。
38．句意：這是非常危險的。
difficult困難的；strong強壯的；dangerous危險的；delicious美味的。用濕手觸摸電器可能觸電，所以這是很危險的。故選C。
39．句意：在我們國家，我們已經使用電很多年了。
days天；weeks周；months月；years年。根據“It is a long time.”，所以這里應該是說在我們國家，我們使用電很多年了。故選D。
40．句意：生產電也會污染我們周圍的環境。
protects保護；saves拯救；pollutes污染；improves提高。前面說我們浪費了大量電，這里說發電也會對環境有不好影響，應該是污染環境。故選C。
41．句意：正如一句諺語所說：“行動勝于言語。”
saying諺語；hearing聽見；feeling感覺；thinking想法。“Actions speak louder than words.”這是一句諺語，所以用saying。故選A。
42．句意：從現在開始，請參加到節約用電的行動中來。
meet遇見；arrive到達；connect連接；join參加。這里是呼吁大家從現在開始參加到節約用電的行動中來。“join in”是固定短語，意為“參加”。故選D。
43．B 44．C 45．A 46．B 47．D
【導語】本文介紹了Robofood團隊通過融合食品科學與機器人技術，開發出可食用無人機、傳感器和電池等創新產品，旨在實現電子設備可食用化并兼顧環保功能的研究成果。
43． 細節理解題。根據“The program aims to (旨在) make robots that can be eaten and foods that act like robots by mixing food science and robots in a new way.”可知，Robofood旨在制造出可食用的電子產品。故選B。
44．細節理解題。根據“However, the main challenge is finding stronger edible (可食用的) materials for the drone’s wings to prepare for bad weather and high temperatures—of course, the chocolate may melt (融化) easily.”可知，Robofood的無人機材料不夠堅固。故選C。
45．細節理解題。根據“It’s different from other sensors because it’s easy for your body to digest (消化), so it won’t leave any remains inside the body.”可知，與其他檢查胃部的傳感器相比，Robofood的傳感器對人體更安全。故選A。
46．細節理解題。根據“The invention of Robofood also helps with environmental protection. There are batteries that you can fully eat.”以及“They are made from natural things…This helps the environment because you won’t have to throw them away like other batteries.”可知，Robofood的材料對大自然有益是因為它減少了污染。故選B。
47．主旨大意題。通讀文章可知，核心主題是Robofood開發以可食用材料為主的機器人及傳感器（如無人機、電池、胃部傳感器）。故選D。
48．B 49．C 50．B 51．C 52．A
【導語】本文主要介紹了什么是電，以及發電有很多種方法及提倡節約用電。
48．段落大意題。通讀第三段尤其是第一、二句“Here is a simple description. Everything in the world is made of atoms.”及最后一句“This is electricity.”可知，作者在第三段提到原子是為了解釋電是什么。故選B。
49．推理判斷題。根據第一段最后一句“It has always existed, but humans learned about it only 500 years ago.”可知，電一直存在，但人類在500年前才知道它，說明人類對電的認知是在相對較近的歷史時期才出現的，則選項C“它的存在在歷史上是最近才被認識到的”表述正確。故選C。
50．推理判斷題。根據第三段中介紹了原子結構后指出 “As the electrons move, a current is created. This is electricity.”可知，解釋原子結構是為了說明電子運動產生電流，從而解釋電的本質。故選B。
51．推理判斷題。根據倒數第二段“It takes a lot of energy to make electricity…Our planet is running out of these resources, and using them creates a lot of pollution.”可知，當前依賴化石燃料發電會導致污染和資源枯竭，則作者是指當前電力生產將導致對石油和煤炭的依賴，造成環境問題。故選C。
52．最佳標題題。通讀全文，本文主要介紹了什么是電，以及發電有很多種方法及提倡節約用電，選項A“如何發電”符合。故選A。
53．A 54．D 55．C 56．B 57．E
【導語】本文主要講述了電的重要性以及節約用電的具體建議。
53．根據“Electricity is an important part in our life. We can’t see or touch it, but it is all around us.”可知，此處介紹電的重要性，選項A “沒有電，我們的生活將非常糟糕。” 符合語境。故選A。
54．根據“When it is not completely dark, many street lamps (路燈) light up early in some streets of places.”可知，此處是介紹浪費電的具體例子，選項D“有些人離開房間時不關燈。”符合語境。故選D。
55．根據“We light them from 7:00 p.m.-5:30 a.m. in summer, and from 5:30 p.m.-6:00 a.m. in winter.”可知，是介紹打開燈的時間，選項C “按時開啟路燈。”符合語境。故選C。
56．根據“The distance (距離) between street lamps can be 50-60 meters.”可知，空處應介紹路燈設置在50到60米之間的原因，選項B“這能節約電力和金錢。”符合語境。故選B。
57．根據“Electricity is a valuable resource (資源). It helps us live well and conveniently.”可知，電是寶貴的資源，有助于我們生活得更好、更便利，因此我們應該采取行動節約用電，選項E“我們應立即行動節約用電！”符合語境。故選E。
58．(s)tarted 59．(s)witch 60．(e)xample 61．(s)ave 62．(p)lanet
【導語】本文主要介紹了地球一小時活動。
58．句意：它始于2007年3月31日。根據語境并結合首字母可知空處應用start；句子時態為一般過去時，謂語動詞應用過去式，故填(s)tarted。
59．句意：在這一天，數百萬人將關掉他們的燈，在黑暗中停留一小時。由“staying in darkness”可知此處表示關燈，switch off“關掉”，will后應用動詞原形。故填(s)witch。
60．句意：他們中的一些人還放棄使用其他電器，例如空調、電視和電腦。根據“air conditioners, TVs, and computers.”和首字母提示，此處是舉例說明，for example“例如”，表示舉例說明。故填(e)xample。
61．句意：他們這樣做是為了節省電力。根據句意和首字母提示可知，此處表示節約用電，save“節省，節約”，動詞不定式符號to后面跟動詞原形。故填(s)ave。
62．句意：地球一小時不僅僅是減少電力的使用，更是關心我們美麗的星球——地球。根據“the Earth”可知，此處表示“星球”，planet“行星，地球”，用單數形式。故填(p)lanet。
63．例文
Protect Man’s Best Friends
Animals and plants are our best friends. They help us a lot in our daily lives.
Jim thinks animals do many things for us, such as helping blind people. Anna believes that plants can make the air clean and fresh. And they make our lives more convenient. As for me, animals are so lovely that they always make us happy and plants provide us with food as well.
It is important for us to protect our best friends. It’s time to take action. First, stop cutting down trees. Second, don’t throw rubbish everywhere to keep the environment clean. Let’s work together to protect them.
【詳解】[總體分析]
題材：本文是一篇材料作文；
時態：時態主要為“一般現在時”；
提示：寫作要點已給出，考生應注意不要遺漏“表格要點提示”中的信息，適當添加細節，并突出寫作重點。
[寫作步驟]
第一步，開篇點題，表明動植物是人類最好的朋友；
第二步，具體闡述各自關于保護動植物的觀點；
第三步，提出呼吁行動，書寫結語。
[亮點詞匯]
①such as例如
②convenient方便的
③provide...with...為……提供……
[高分句型]
①Jim thinks animals do many things for us, such as helping blind people. (省略that的賓語從句)
②As for me, animals are so lovely that they always make us happy and plants provide us with food as well. (so... that引導的結果狀語從句)
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