高中英語(yǔ)必修三 Unit 4 Space Exploration（A卷基礎(chǔ)卷）（解析版）

1、Unit 4 Space Exploration測(cè)試卷（A卷基礎(chǔ)卷）解析版 【新人教版】注意事項(xiàng)：1. 答卷前，考生務(wù)必將自己的姓名、考生號(hào)等填寫在答題卡上。2. 回答選擇題時(shí)，選出每小題答案后，用鉛筆把答題卡上對(duì)應(yīng)題目的答案標(biāo)號(hào)涂黑。如需改動(dòng)，用橡皮擦干凈后，再選涂其他答案標(biāo)號(hào)?；卮鸱沁x擇題時(shí)，將答案寫在答題卡上，寫在本試卷上無(wú)效。3. 考試結(jié)束后，將本試卷和答題卡一并交回。第一部分 閱讀理解（共兩節(jié)，滿分50分）第一節(jié) （共15小題；每小題2.5分，滿分37.5分）閱讀下列短文，從每題所給的A、B、C和D四個(gè)選項(xiàng)中，選出最佳選項(xiàng)。A No human has set foot on the

2、 Moon since 1972. Now, after more than four decades of inactivity, interest in putting humans back on the Moon is finally heating up again. But who will get there first? CHINAOn 14 December 2013, China successfully landed its Jade Rabbit rover(探測(cè)車)on the Moon. It is now working on its next explorati

3、on mission. Named Change 4, the mission is scheduled to touch down in the Aitken Basin near the end of 2018. If successful, it will be the first landing on the Moons far side. RUSSIARussia plans a manned Moon landing in 2030. It is currently working on a project whose idea is that the landers will e

4、xplore the south pole of the Moon, exploring for resources such as minerals and water ice to be used to provide for a human outpost(前哨站). INDIAFollowing the success of its Chandrayaan-1 in 2008, India announced a follow-on mission. Chandrayaan-2 was meant to cooperate with Russia. But when the Russi

5、ans failed to deliver the promised lander in 2013, India decided to go it alone. Chandrayaan-2 is about to be sent up in 2018. U. S. A. In December 2018, NASA plans to send up the Exploration Mission 1, an uncrewed test of their Orion astronaut capsule in which the craft will circle around the Moon

6、before returning to Earth. All being well, a crewed capsule will follow in 2023. Should the mission prove a success, the astronauts will be the first humans to see the far side of the Moon with their own eyes since Apollo 17 in 1972. 1. What will China do in its next space mission? A. Improve its Ja

7、de Rabbit rover. B. Work with other countries. C. Land Change 4 on the Moon. D. Explore the south pole of the Moon. 【答案】C【解析】本題考查細(xì)節(jié)理解題。根據(jù)第二段第三句可知, 嫦娥四號(hào)將在2018年底降落在月球Aitken Basin地區(qū)。據(jù)此可知, 中國(guó)的下一步空間計(jì)劃是嫦娥四號(hào)登月, 故選C項(xiàng)。2. Why did India try to carry out its follow-on mission alone? A. It couldnt find a partner

8、. B. It didnt get the lander as planned. C. The Russians refused to work with India. D. It planned to launch Chandrayaan-2 in advance. 【答案】B【解析】本題考查細(xì)節(jié)理解題。根據(jù)第四段第三句可知, 由于俄羅斯沒能給印度提供著陸器, 因此印度決定自己實(shí)施登月計(jì)劃, 故項(xiàng)B項(xiàng)。3. Which country is interested in resources on the Moon? A. Russia. B. China. C. India. D. U. S.

9、 A. 【答案】A【解析】本題考查細(xì)節(jié)理解題。根據(jù)第三段第二句可知, 當(dāng)前俄羅斯正啟動(dòng)一項(xiàng)工程, 其思路是登陸器將探索月球的南極, 尋找礦物質(zhì)和水冰等資源以供人類前哨站使用。故選A項(xiàng)。B Since several organizations plan to put the first man on Mars by 2030, new trips to the moon will take place around 2020-2025. If you go to the moon, you need a place to stay in. What will it be like? Maybe

10、 the following article can give us some inspiration. August 23, 2025-Today a new chapter in space travel is written. Rod Markham and his wife-to-be Susan Milliliter arrived safely at the moon to spend 5 nights as the first guests at the Starbright Hotel that was set up for this purpose two years ago

11、. Not only are they the first hotel guests on the moon, but they also set a new record for expensive accommodation since the price was $3.7 million per night, per person. However, the move from the earth to the hotel was included in the price. The hotel itself will probably have a hard time just to

12、try to gain one star in any hotel rating system, since there is no room service. The guests have to do the cleaning of the room themselves and there is no bathroom in it. However, they have more stars than they need just outside their Rod and Susan will get married by linking their local minister in

13、 San Diego, California at 9:00 pm EST tonight, and the wedding will be broadcast live by several major TV networks in a 1-hour special report, including the preparations for the trip. Six astronauts are along with them and during the stay theyll set up further accommodations for the guests who have

14、made reservations at the Star-bright Hotel next year. The hotel has no employees, only some workers when guests stay at it.What does the new chapter in space travel refer to according to Paragraph 2?Human landed on Mars for the first time.B. The first hotel on the moon was set up.C. The first hotel

15、guests landed on the moon.D. The hotel on Mars welcomed its first guests.【答案】【解析】本題考查細(xì)節(jié)理解題。根據(jù)第二段的第二句Rod Markham and his wife-to-be Susan Milliliter arrived safely at the moon to spend 5 nights as the first guests at the Starbright Hotel that was set up for this purpose two years ago.可知，這里的新篇章指的是月球迎來(lái)

16、了第一批住宿的旅客，故選C項(xiàng)。5. During the couples stay at the Star-bright Hotel, they _.A. cant find much helpB. will get five-star serviceC. have to cook food themselvesD. can use the bathroom in their room【答案】A【解析】本題考查推理判斷題。根據(jù)第四段的內(nèi)容可知，這個(gè)旅館沒有客房服務(wù)，因此夫妻倆許多事都要親力親為，不會(huì)得到很多幫助，故選A項(xiàng)。6. What can we learn about the weddi

17、ng of Rod and Susan?A. It will last for an hour.B. It can be watched live on the earth.C. A minister on the moon will host it.D. Their relatives and friends will be present.【答案】B【解析】本題考查細(xì)節(jié)理解題。根據(jù)第五段內(nèi)容可知，婚禮上他們會(huì)連線在圣迭戈的神父做主持，并由幾家電視臺(tái)進(jìn)行實(shí)況轉(zhuǎn)播，故選B項(xiàng)。7. What will the six astronauts do during the stay of Rod an

18、d Susan?A. Accept reservations from others.B. Improve room service for the couple.C. Look for several employees for the hotel.D. Prepare accommodations for future guests.【答案】D【解析】本題考查細(xì)節(jié)理解題。根據(jù)最后一段的第一句Six astronauts are along with them and during the stay theyll set up further accommodations for the g

19、uests who have made reservations at the Star-bright Hotel next year.可知，這六個(gè)宇航員會(huì)在那里為接下來(lái)已預(yù)訂旅館的人準(zhǔn)備住宿，故選D項(xiàng)。 C At first, the earths surface layer (層) was made up of huge blocks of hard, solid rocks. Then slowly, the rocks broke up into smaller and smaller pieces. Finally stones, pebbles (卵石) and grains of

20、 sand were formed. Many sorts of plants and animals lived and died on the surface of the earth. Their remains mixed with stones and pebbles formed soil. The outmost layer of the earth is soil. There are many ways in which large pieces of rock break into smaller ones. Wind, water, heat and cold help

21、to break up rocks. When winds blow grains of sand against a large rock for a long time, the softer layers of the rock are slowly worn away. That leaves holes and cracks in the rock, which become bigger and finally the rock breaks up into smaller pieces. The moving water of streams and rivers also he

22、lps to break up rocks. As the water moves along, it carries with small pieces of rock. These rub the larger ones. Thus, the larger rocks are worn down to smaller pieces. The heat of the sun is also helpful to breaking up rocks. When the sun shines, the rocks become very hot. If these rocks are sudde

23、nly cooled, they may crack. Ice also plays a part in making soil. Water in the cracks can turn into ice in cold weather. As this happens, the cracks become bigger and wider, and finally break into smaller pieces.According to the passage, soil _.forms very slowlyB. is a mixture of stones, pebbles and

24、 sandC. makes up the layers of the earthD. is becoming smaller and smaller【答案】A【解析】本題考查推理判斷題。第一段中提到巖石慢慢地破裂，成為小的石頭，其后動(dòng)植物遺體跟石頭、卵石混合在一起，形成了土壤，可推知土壤的形成非常慢。故選A項(xiàng)。9. How many factors are mentioned in helping break up rocks?A. Three.B. Four.C. Five.D. More than five.【答案】B【解析】本題考查細(xì)節(jié)理解題。根據(jù)第二段中的“Wind, water, h

25、eat and cold”以及文章內(nèi)容可知，促進(jìn)巖石破裂主要有四種方法，故選B項(xiàng)。10. Which of the following is NOT true?A. The remains of many plants and animals formed soil.B. If a large rock never moves, it will never break up.C. The changes in temperature will help to break up rocks.D. Ice in the cracks helps to break up rocks.【答案】B【解析

26、】本題考查細(xì)節(jié)理解題。根據(jù)文中的四種巖石破裂的方法可知，即使巖石不動(dòng)，它也會(huì)碎，故選B項(xiàng)。11. The best title for this passage should be _.A. Soil from RocksB. Ways to Break up RocksC. Soil on the EarthD. Soil, Outmost Layer of the Earth【答案】B【解析】本題考查主旨大意題。本文主要介紹了巖石破裂的方法，因此標(biāo)題與巖石碎裂有關(guān)，因此最好的題目為B.Ways to Break up Rocks，故選B項(xiàng)。 D I have recently moved

27、to Hamburg in Germany and have always heard that Germans just wear jeans or some strange clothes. Since I moved here, I have found this actually is completely false and I think I would prefer it if they did just wear jeans, so I could do the same! Hamburg is a very big shopping city. Apart from H&M,

28、 New Yorker and Mango, I have found a New Look and a new Topshop have recently just opened. These shops are quite popular in the UK and sell clothes which are always considered as very fashionable. Another thing I am really struggling with is that I am trying to find the right clothes for the weathe

29、r. I have found in Hamburg one minute it is nice and sunny, but the next minute it is throwing it down with rain! One day it might start off really rainy and cold, but by lunch time it is sunny and really hot, so wearing a coat is not practical. In general, however, I think it has also got cold here

30、 very quickly and it already feels like the winter that I am used to. I frequently go out in my winter coat, hat, gloves and scarf while many other people are still only wearing jeans or leather jackets. I dont understand how they do it as I am always freezing. Is it better to blend in with (與協(xié)調(diào)) fa

31、shion or be warm? I think I would rather be warm and maybe look like a bit of a banana in a huge coat rather than be shivering all day. What do you think? Clearly I am missing something here as I seem to be the only one to struggle with these fashion decisions.When the writer is in Hamburg, she find

32、s Germans _.care more about what to wearB. dont always wear jeansC. like wearing fashionable clothesD. like wearing jeans【答案】B【解析】本題考查細(xì)節(jié)理解題。從第一段的.have always heard that Germans just wear jeans or some strange clothes. Since I moved here, I have found this actually is completely false可知，德國(guó)人只穿牛仔褲的說法是錯(cuò)

33、誤的，他們并不總是穿牛仔褲，故選B項(xiàng)。13. Shopping in Hamburg is very _.A. difficultB. funnyC. excitingD. convenient【答案】D【解析】本題考查細(xì)節(jié)理解題。從第二段的Hamburg is a very big shopping city. Apart from H&M, New Yorker and Mango, I have found a New Look and a new Topshop have recently just opened可知，漢堡有很多大型服裝品牌，購(gòu)物是很方便的，故選D項(xiàng)。14. We kn

34、ow the weather in Hamburg is _.A. changeableB. comfortableC. rainyD. lovely【答案】A【解析】本題考查細(xì)節(jié)理解題。從第三段的I have found in Hamburg one minute it is nice and sunny, but the next minute it is throwing it down with rain可知，漢堡的天氣是易變的，故選A項(xiàng)。15. What does the underlined word shivering probably mean?A. Wandering.B.

35、Searching.C. Shaking.D. Watching.【答案】C【解析】本題考查詞句猜測(cè)題。從前面的I dont understand how they do it as I am always freezing及I think I would rather be warm可以判斷出，畫線詞的詞義應(yīng)該是因寒冷而發(fā)抖，故選C項(xiàng)。第二節(jié) （共5小題；每小題2.5分，滿分12.5分）根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。Life on Mars: Is it really possible? Now that Curiosity is beam

36、ing back Earth-like pictures of Martian landscape, the old question raises its head: Could man and woman ever go there? The answer is very definitely yes. There are a number of practical challenges to overcome first, however. There are differences between Earth and Mars, but also a number of similar

37、ities. (16) Phobos and Deimos Unlike Earth, Mars does not have a polar magnetic field. Scientists believe that the two Martian moons, Phobos and Deimos, are little planets. (17) (18) For the annual IGEM or International Genetically Engineered Machines competition, students around the world attempt t

38、o make living cells perform new tasks. In preparation for the human colonization of Mars, seeds and organic matter would have to be transported from Earth to begin growing plants and establishing a food supply.Super-sized Bees Plants need pollinators as well as water, and the best pollinator on Eart

39、h is the humble bee-and entire hives would be transported to Mars. (19) However, without natural predators, they could grow very large, indeed.Overcoming Challenges-Opening Possibilities There will be other challenges to overcome, for example, the effect on the human body of living in a field with l

40、ow gravity. (20) Right now, we ought to welcome the challenges. The more challenges we overcome now, the more prepared we will be for moving out of our solar system and into the grand, universal adventure that is ahead of us.AIGEMBThe next question is: Could man colonize Mars?COnce there, the insect

41、s would be let loose among the plants.DHowever, all kinds of other interesting things will be happening.EBut these are already issues for astronauts living on the International Space Station.FThey do not have the stabilizing effect on the spin of the planet like the moon has upon Earth.GMars has Ear

42、th-like seasons and the planet surface is abundant in minerals essential for plant growth.16.【答案】G【解析】根據(jù)上句There are differences between Earth and Mars, but also a number of similarities.介紹地球與火星有不同但也有相似之處，下面應(yīng)具體舉例。G項(xiàng)指出火星擁有與地球相似的季節(jié)和植物生長(zhǎng)所必需的礦物質(zhì)，符合語(yǔ)境，故選G項(xiàng)。17.【答案】F【解析】根據(jù)上文 Unlike Earth, Mars does not have

43、 a polar magnetic field. Scientists believe that the two Martian moons, Phobos and Deimos, are little planets.提到科學(xué)家認(rèn)為Phobos和Deimos是火星的月亮，但其實(shí)是兩顆小行星，因此它們對(duì)火星的旋轉(zhuǎn)沒有月亮對(duì)地球一樣的穩(wěn)定作用，故選F項(xiàng)。18.【答案】A【解析】根據(jù)下文 For the annual IGEM or International Genetically Engineered Machines competition, students around the worl

44、d attempt to make living cells perform new tasks. 出現(xiàn)IGEM關(guān)鍵詞，由此可知A項(xiàng)符合本段的小標(biāo)題，故選A項(xiàng)。19.【答案】C【解析】根據(jù)上文 Plants need pollinators as well as water, and the best pollinator on Earth is the humble bee-and entire hives would be transported to Mars.提到為了把傳粉者蜜蜂運(yùn)到火星上，要把完整的蜂巢運(yùn)過去，下面應(yīng)介紹到達(dá)火星以后怎么做，故選C項(xiàng)。20.【答案】E【解析】根據(jù)上一句

45、 There will be other challenges to overcome, for example, the effect on the human body of living in a field with low gravity.提到到火星以后將面對(duì)重力較小的問題，這正好是國(guó)際空間站的宇航員們遇到過的問題，E項(xiàng)符合語(yǔ)境。故選E項(xiàng)。第二部分 語(yǔ)言運(yùn)用（共兩節(jié)，滿分30分）第一節(jié) （共15小題；每小題1分，滿分15分）閱讀下面短文，從短文后各題所給的A、B、C和D四個(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)。All passengers boarded (登機(jī)), and the

46、flight would be on time. However, I noticed an adult passenger sitting at the gate (登機(jī)口) crying. I asked the gate staff what was up and they told me the passenger was not (21) to board due to a problem of his ticket. His last name in the ticket was (22) wrongly by a letter but he had (23) it before.

47、 The man told me that his father was just in the (24) and he needed to take this flight to hopefully see him before he (25) . Unfortunately, there was nothing the gate staff could do about it. They toht him to buy a new ticket. (26) , the flight was to leave ten minutes later and it was impossible f

48、or him to do so. He told me he wou|d be really (27) if he wouldnt be able to say his final goodbye to his dad. Seeing a grown man crying sadly, I was sure that he was telling the (28) . I considered for a while and then thought of (29) I could do to help him. As a member of the staff, I have a (30)

49、-I can issue (發(fā)) tickets through an online system to my family or (31) . Then, I provided a staff ticket for this passenger. I passed the ticket to him (32) his knowing what Id done. I just hoped that he wouldnt (33) any of his fathers last words. Later, the gate staff told me they would help me kee

50、p the (34) as we can only use the staff tickets for people we know. I was so proud that day (35) I did something meaningful for a person in need.A. forcedB. allowedC. advisedD. persuaded【答案】B【解析】本題考查動(dòng)詞辨析。句意：我問登機(jī)口工作人員怎么了，他們告訴我，這位乘客因?yàn)闄C(jī)票問題不能登機(jī)。A.強(qiáng)迫；B.允許；C.建議；D.說服。根據(jù)后文的“due to a problem of his ticket”可知

51、，那位乘客因?yàn)樗臋C(jī)票有問題而不被允許(allowed)登機(jī)，故選B項(xiàng)。A. readB. spelledC. understoodD. remembered【答案】B【解析】本題考查動(dòng)詞辨析。句意：他票上的的姓氏被拼錯(cuò)了一個(gè)字母，但他之前忽略了。A.讀；B.拼寫；C.理解，明白；D.記得。根據(jù)“His last name in the ticket was _22_ wrongly by a letter”可知，那位乘客機(jī)票上的姓氏應(yīng)該是被拼寫(spelled)錯(cuò)了一個(gè)字母，故選B。A. foundB. recordedC. imaginedD. ignored【答案】D【解析】本題考查動(dòng)詞

52、辨析。句意同上。A.發(fā)現(xiàn)，找到；B.記錄；C.想像，設(shè)想；D.忽略。根據(jù)語(yǔ)境可知，那位乘客票面上的姓氏有誤，但他之前忽略了(ignored)，故選D項(xiàng)。A. airportB. officeC. schoolD. hospital【答案】D【解析】本題考查名詞辨析。句意：那個(gè)人告訴我他父親剛剛住院了，在他去世之前，他需要乘坐這趟飛機(jī)去見他。A.機(jī)場(chǎng)；B.辦公室；C.學(xué)校；D.醫(yī)院。根據(jù)后文的“if he wouldnt be able to say his final goodbye to his dad”可知，那位乘客的父親快要去世了，所以應(yīng)該是在醫(yī)院(hospital)里，故選D項(xiàng)。A.

53、gave upB. came backC. passed awayD. settled down【答案】C【解析】本題考查動(dòng)詞辨析。句意同上。A.放棄；B.回來(lái)，恢復(fù)(知覺、記憶等)；C.消失，去世；D.定居，平靜下來(lái)。根據(jù)前文“and he needed to take this flight to hopefully see him”可知，那位乘客希望乘這班飛機(jī)趕到醫(yī)院，在他父親臨終(passed away)前見一面，故選C項(xiàng)。A. InsteadB. HoweverC. OtherwiseD. Therefore【答案】B【解析】本題考查副詞辨析。句意：然而，飛機(jī)十分鐘后起飛，這對(duì)他來(lái)說

54、是不可能的。A.代替；B.然而；C.否則；D.因此。根據(jù)語(yǔ)境可知，工作人員告訴該乘客重新買一張票，但是(However)飛機(jī)馬上就要起飛，時(shí)間來(lái)不及了。前后是轉(zhuǎn)折關(guān)系，故選B項(xiàng)。A. regretfulB. confusedC. anxiousD. hopeless【答案】A【解析】本題考查形容詞辨析。句意：他告訴如果他不能跟父親臨終道別，我他會(huì)非常遺憾。A.遺憾的；B.困惑的；C.焦急的；D.絕望的。根據(jù)后文“if he wouldnt be able to say his final goodbye to his dad”可知，如果不能跟父親臨終道別，那位乘客應(yīng)該會(huì)非常遺憾(regretf

55、ul)，故選A項(xiàng)。A. lieB. truthC. jokeD. story【答案】B【解析】本題考查名詞辨析。句意：看到一個(gè)成年人傷心地哭泣，我確信他說的是實(shí)話。A.謊話；B.事實(shí)；C.笑話；D.故事。根據(jù)上文的“Seeing a grown man crying sadly”可知，看到一個(gè)成年男人哭得那么傷心，作者確信他說的是事實(shí)(truth)，故選B項(xiàng)。A. nothingB. anythingC. somethingD. everything【答案】C【解析】本題考查不定代詞辨析。句意：我考慮了一會(huì)兒，然后我想到了我能幫他的忙。A.無(wú)事；B.任何事物；C.某事；D.一切。根據(jù)語(yǔ)境可知，

56、作者考慮了一會(huì)兒，想到了為幫助那位乘客他可以做的事情(something)，故選C項(xiàng)。A. goalB. dutyC. taskD. right【答案】D【解析】本題考查名詞辨析。句意：作為員工，我有權(quán)利我可以通過在線系統(tǒng)給我的家人或朋友買票。A.目標(biāo)；B.職責(zé)；C.任務(wù)；D.權(quán)利。根據(jù)后文“I can issue tickets through an online system to my family”可知，作為工作人員，作者有權(quán)(right)通過在線系統(tǒng)為一些人簽發(fā)機(jī)票，故選D項(xiàng)。A. petsB. friendsC. customersD. passengers【答案】B【解析】本題考

57、查名詞辨析。句意同上。A.寵物；B.朋友；C.顧客；D.乘客。根據(jù)后文“we can only use the staff tickets for people we know”可知，工作人員只能為自己的家人和認(rèn)識(shí)的朋友(friends)買票，故選B項(xiàng)。A. forB. afterC. sinceD. without【答案】D【解析】本題考查介詞辨析。句意：我把票遞給了他，并沒有讓他知道我做了什么。A.為了；B.在以后；C.自從；D.沒有。根據(jù)語(yǔ)境可知，作者并不期望回報(bào)，所以他只是將票遞給那位乘客，沒(without)讓他知道作者為他所做的事，故選D項(xiàng)。A. missB. repeatC. f

58、orgetD. mind【答案】A【解析】本題考查動(dòng)詞辨析。句意：我只是希望他不會(huì)錯(cuò)過他父親的任何臨終遺言。A.錯(cuò)過；B.重復(fù)；C.忘記；D.介意。根據(jù)語(yǔ)境可知，作者希望那位乘客不會(huì)錯(cuò)過(miss)他父親的任何臨終遺言，故選A項(xiàng)。A. secretB. ruleC. promiseD. appointment【答案】A【解析】本題考查名詞辨析。句意：后來(lái)，登機(jī)口工作人員告訴我他們會(huì)幫我保守秘密，因?yàn)橹挥形覀冋J(rèn)識(shí)的人才能用員工票。A.秘密；B.規(guī)則；C.承諾；D.約定。根據(jù)后文“as we can only use the staff tickets for people we know”可知，

59、工作人員只能為認(rèn)識(shí)的人買票，所以嚴(yán)格來(lái)說作者的做法是違規(guī)的，但登機(jī)口工作人員表示會(huì)幫作者保守這個(gè)秘密(secret)，故選A項(xiàng)。A. becauseB. beforeC. untilD. unless【答案】A【解析】本題考查連詞辨析。句意：我那天感到非常自豪，因?yàn)槲覟橐粋€(gè)需要幫助的人做了一件有意義的事。A.因?yàn)椋籅.在以前；C.直到；D.除非。根據(jù)語(yǔ)境可知，作者那天感到非常自豪，因?yàn)?because)他為需要幫助的人做了件有意義的事情，故選A項(xiàng)。第二節(jié) （共10小題；每小題1.5分，滿分15分）閱讀下面短文，在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。Life on MarsSome

60、people believe humans could live on the planet Mars by the year 2100. Our own planet, the Earth, is becoming more and more crowded and polluted because of the rapid increase in population. (36)(hopeful), people could start all over again and build (37) better world on Mars. Here is what life there c