2021-2022学年新教材高中英语 课时练习十六 Unit 6 Starting out .doc

1、Unit 6Starting out & Understanding ideas. 单句语法填空1. The new law restricts(restrict) the sale of guns. 2. It is so greedy (greed) of you to leave none of the cake for everyone else. 3. Adapting(adapt) to school life quickly is important for freshmen, which will influence their performances. 4. Weve tr

2、ied to make the design of racing bicycles more appealing(appeal) to young people. 5. Now we seldom carry cash, so the thieves (thief) are having a hard time. 6. As a student, do you think that it is worthwhile to spend a great amount of time on computer games? 7. Some animals can adapt to the urban

3、and suburban (suburb) environment quite well. 8. It is estimated(estimate) that up to 100, 000 people watch or take part in fox hunting. 9. It didnt take the children a long time to figure(figure) out the correct answer. 10. When his friend was in trouble, he lent him a hand without hesitation (hesi

4、tate). . 选词填空throw away, adapt to, crash into, be responsible for, out of reach of, take over, under construction, for sure, fit in with, get a taste for 1. Cooking, traditionally undertaken by mothers, has been often taken over by fathers nowadays. 2. The building under construction is a public lib

5、rary. 3. Even to this day we dont know what happened for sure. 4. Ive got boxes of old clothes, which I really should throw away. 5. Learning to relieve stress is a necessary means to adapt to modern society. 6. A truck went out of control, and crashed into the back of the bus. 7. Most people who co

6、me from other countries seem to fit in with the way of life here. 8. The cyclist, rather than the bus driver, should be responsible for the accident. 9. If you go to New Orleans, you will get a taste for jazz. 10. These products are normally bought and stored carefully out of reach of children. . 完成

7、句子1. Only by working hard can we live a happy life. 只有通过努力工作, 我们才能过上幸福的生活。2. At last the thief had no choice but to admit stealing the computer from the office. 最后那个小偷没有别的选择, 只能承认从办公室偷了电脑。3. With all the work finished, they hurried back home for lunch. (with复合结构)所有的工作完成后, 他们急忙回家吃午饭。4. Its important

8、that we should have a positive attitude to life. 重要的是我们对生活要有积极的态度。5. The government is committed to protecting the interests of tenants. 政府致力于保护房客的利益。. 结合课文主题并使用本单元词汇与句型, 根据提示写一篇80词左右的短文1. 如果没有野生动植物与我们作伴, 地球上的人类也延续不下去。(with复合结构)2. 野生动植物提供了(offer)很多益处(benefit)。正是野生动植物帮我们制造氧气、食物、提供各种资源。(强调句)3. 目前野生动植物

9、还没有(have yet to)得到很好的保护。4. 只有靠自己的聪明才智, 我们才能保护好野生动植物。(倒装句)5. 让野生动植物和人类和平相处很重要。(It is important that. . . )Wild animals and plants are closely related to our life. Without wild animals and plants, we human beings on earth will not be able to continue to survive. As we all know, wildlife offers many be

10、nefits. It is wildlife that helps us produce oxygen, food and all kinds of resources. At present, wildlife has yet to be well protected. Only by our intelligence can we protect wildlife. Its important that wildlife and human beings should live in harmony with each other. . 阅读理解A(2021遂宁高二检测)New Zeala

11、nd is one of the best countries in the world to experience how life might have been in prehistoric times. New Zealand is a natural lovers paradise(乐园) with its conservation reserves. Kaharoa ConservationThe Kaharoa Conservation is home to a number of endangered birds and the North Island Kokako is j

12、ust one of them. The Kokako is possibly New Zealands most beautiful songbird with such a variety of whistles, clicks, buzzes and whirrs in its sound range. One bird sounds like a chorus! Mokaihaha Ecological AreaRich in Maori history, the Mokaihaha Ecological Area has high conservation and scientifi

13、c value. Birdlife features this natural wonderland with the symphony including such stars as the Tui, Kereru, Fantail, Bellbird and the endangered Kokako. Whakarewarewa Forest Conservation ParkIf mountain biking is your thing, then this is the place for you! The Whakarewarewa Forest provides a netwo

14、rk of tracks through exceptionally impressive scenery that has made Rotorua famous for its mountain biking. Maungatautari Ecological IslandA project of great ecological importance is being undertaken by a community aimed at the restoration of Maungatautari volcano forest. The volcano forest has sust

15、ained the lives of its wildlife for hundreds of years but since the introduction of European pests such as deer, rabbits, goats, pigs and rats, the native varieties of mammals, birds and plants have been facing threats. The aim of the courageous project is to get rid of all introduced pests from the

16、 3363 hectares of forest. Luckily, life in the forest of Maungatautari is beginning to awaken again. 【文章大意】这是一篇应用文。对新西兰的自然保护区进行了介绍。1. What is special about the bird Kokako? A. It can make different sounds. B. It is a common species. C. It only lives in the Kaharoa Conservation. D. It is the most bea

17、utiful birds in the world. 【解析】选A。细节理解题。根据第二段可知Kokako可能是新西兰最美丽的鸣禽, 在它的音域里有各种各样的口哨、咔哒声、嗡嗡声和旋转声, 一只鸟听起来就像合唱队! 由此可推知, Kokako可以发出不同的声音。故选A。2. Which is suitable for mountain biking lovers? A. Kaharoa Conservation. B. Mokaihaha Ecological Area. C. Whakarewarewa Forest Conservation Park. D. Maungatautari E

18、cological Island. 【解析】选C。细节理解题。根据第四段第一句可知, 如果你喜欢山地骑行, 那么这里就是适合你的地方! 可推知, “Whakarewarewa Forest Conservation Park”是最适合山地骑行爱好者的地方。故选C。3. What can we learn about Maungatautari Ecological Island? A. There is a live volcano on the island. B. Introduced species threaten native ones. C. The restoration pro

19、ject is of no effect. D. It is rich in Maori history. 【解析】选B。细节理解题。根据第六段可知自从鹿、兔子、山羊、猪和老鼠等欧洲动物的传入, 本地的各种哺乳动物、鸟类和植物一直面临着威胁。可推知, 外来物种威胁着该岛的本地物种。故选B。BBlack rhinos(犀牛) have terrible eyesight. Even so, these African giants easily fend off hungry predators such as lions and hyenas. Their basic body plan ha

20、s proved to be good enough to survive on African grasslands full of large predators, being very large, thick-skinned, big sword-like horns. But those protective traits(特征) are no match for humans with guns. Today the species is critically endangered largely due to poaching. But the rhinos may have a

21、n unlikely ally against poachers: the red-billed oxpecker. The chatty, sociable birds often hang out on the backs of rhinos, feasting on parasitic ticks(寄生虫). And actually, research has shown that the tick is the favorite diet of an oxpecker. The birds also get nutrients by picking at sores on the r

22、hinos bodies. Victoria University of Melbourne behavioral ecologist Roan Plotz suspected that the rhinos put up with this indignity because the oxpeckers make loud alarm calls whenever they see humans approach, giving the rhinos an early warning to flee. To test whether the oxpeckers do, in fact, ac

23、t as noisy lookouts, Plotz and his team implanted(植入) radio transmitter in the rhinos horns. This didnt hurt the rhinos and allowed the researchers to track the animals. “And approach them undetected, when the oxpeckers were on the back and when the oxpeckers were not on their backs, to get an idea

24、of if the birds do alarm them and if the rhinos do listen. ”The researchers found that rhinos without oxpeckers detected an approaching human only 23 percent of the time, at an average distance of 27 meters. But when oxpeckers were present, the birds alarmed the rhinos 100 percent of the time. And t

25、hey detected the human 61 meters away on average. And the more oxpeckers on the scene, the greater the detection distance. “It makes sense because the more eyes you have on your back, looking out for you, the more chance that they can pick up anything coming. There can be no doubt that the rhino is

26、listening on the oxpecker alarm call. ”【文章大意】这是一篇说明文。研究表明: 黑犀牛与红嘴牛椋鸟之间是双赢的关系。犀牛可为牛椋鸟提供食物, 而牛椋鸟可为犀牛提供危险警报。4. What does the underlined phrase in the first paragraph mean? A. Defend against. B. Feed. C. Hide from. D. Attract. 【解析】选A。短语猜测题。由文章第一段可知黑犀牛的视力很差。它们的基本身体结构已被证明是足够好的, 可以在到处都是大型食肉动物的非洲草原上生存。可推知,

27、黑犀牛可以抵御(defend against)狮子等大型食肉动物。故猜测fend off为抵御(defend against)之意。故选A项。5. Why do the birds hang on the back of rhinos? A. To protect rhinos from poachers. B. To seek protection from rhinos. C. To find food over the rhinos body. D. To let rhinos carry them around. 【解析】选C。细节理解题。由第二段倒数第二句可知这种健谈、善于交际的鸟经

28、常悬挂在犀牛的背上, 以寄生虫为食。及第三段中第一句可知, 这些鸟也通过啃食犀牛身上的伤口来获取营养。可推知, 牛椋鸟在犀牛背上的原因是: 可以获得食物(find food)。故选C项。6. What do the researchers find? A. Rhinos have poor eyesight. B. The birds alarm and rhinos listen. C. There are many ticks on rhinos. D. The birds have sharp eyes. 【解析】选B。细节理解题。由最后一段最后一句毫无疑问, 犀牛正在听牛椋鸟的警报声。

29、可推知, 研究结果为牛椋鸟确实可以发出警报声, 而犀牛也听到了, B项正确。A项称, 黑犀牛视力差。这句话虽然正确, 但是不是这次的研究发现, A项错误; C项和D项也是同样的错误。故选B项。7. What can best describe the relationship between the birds and rhinos? A. They protect each other from dangers. B. They are food source for each other. C. They depend on each other for survival. D. They

30、 have win-win partnership. 【解析】选D。推理判断题。由第二段中倒数第二句可知这种健谈、善于交际的鸟经常悬挂在犀牛的背上, 以寄生虫为食。及第三段第一句可知这些鸟也通过啃食犀牛身上的伤口来获取营养。可推知, 红嘴牛椋鸟可以在犀牛身上获取食物, 而由最后一段最后一句“毫无疑问, 犀牛正在听牛椋鸟的警报声。”可知, 红嘴牛椋鸟也可以给犀牛发出警报。因此两者之间是双赢的(win-win)关系。故选D项。. 阅读填句The drop in garment prices over the last 20 years has allowed us to buy more and

31、more clothes. We now have 5 times more clothes than our grandparents had. 1It has become a challenge to wear a garment more than five times. Garment quality is declining every year. As a result, our clothes immediately look faded or shapeless not long before purchasing them. 2 We continue to purchas

32、e just to stay up to date. Fast fashion has become a monster in our closets. Whats more, chemicals used in every part of the textile production are greatly harmful. Even clothes made of 100% natural fiber still contain a lot of chemicals. 3 The fashion industry is also the second largest polluter in

33、 the world just after the oil industry. In most countries where garments are produced, waste waters from textiles factories are dumped directly into the rivers. Some of them even reach the sea and eventually spreads around the globe. Clothing has clearly become disposable. 4 A family in the western

34、world throws away an average of 30 kg of clothing each year. Only 15% is recycled or donated, and the rest goes directly to the landfill or is burned. It is also fueling our environmental concern. How can we avoid the environmental impact from the fashion industry? 5 A root of the problem lies in ou

35、r excessive consumerism. Buy better quality. They often last long and good for the environment. Donate your second-hand garments to charity instead of throwing them in dustbins. Whatever your option is, you are doing your part in saving our planet. A. They can present a real danger to our health. B.

36、 As a result, we generate more and more textile waste. C. Trends are changing so quickly that we cannot keep up. D. We dont have many greener options in the fashion industry. E. Think twice before throwing away your second-hand garments. F. To achieve the goal we should first reflect on our lifestyl

37、e and buy less. G. This, in turn, has serious consequences on our consuming habits, our health and our planet. 【文章大意】这是一篇说明文。文章主要讲述了现在人们为了追求时尚, 不断地购买衣物。衣物在某种意义上已经成为了一次性产品。这不仅对我们的健康有害, 同时对环境也造成了影响。作者呼吁人们购买质量好的衣物, 捐赠旧衣服等, 为环保做出自己的努力。1. 【解析】选G。由上文可知我们现在拥有的衣服比我们的祖父母曾经拥有的五倍还多。与G项(这反过来也会给我们的消费习惯、健康和地球带来严重

38、后果。)承接自然, 选项中的this就指代上文的所提到的“We now have 5 times more clothes than our grandparents had. ”, 即现在人们有过多衣服的情况。故选G。2. 【解析】选C。下文的“We continue to purchase just to stay up to date. ”(我们继续购买, 只是为了能够跟上潮流。)与C项Trends are changing so quickly that we cannot keep up. (潮流改变的如此快, 以至于我们根本跟不上。)承接自然, 因为潮流改变很快, 所以只能通过不停

39、购买来跟上。选项中的trends呼应下文的up to date。故选C。3. 【解析】选A。由上文可知此外, 用于纺织生产各个部分的化学物质都非常有害。甚至100%纯天然纤维制成的衣服仍然有大量的化学物质。与A项They can present a real danger to our health. (他们给我们的健康带来了真正的危险。)承接自然, 纺织生产的各个部分都添加了有害的化学物质, 他们给我们的健康带来危险。选项中的they就指代上文的chemicals。故选A。4. 【解析】选B。上文“Clothing has clearly become disposable. ”(很明显,

40、衣服已经变成一次性的了。)与B项As a result, we generate more and more textile waste. (因此, 我们产生了越来越多的纺织垃圾。)承接自然, 上下文构成明显的因果关系。因为衣服成为一次性的, 所以会产生越来越多的纺织垃圾。故选B。5. 【解析】选F。由上文可知我们如何避免时尚产业对环境的影响与F项To achieve the goal we should first reflect on our lifestyle and buy less. (为了实现这个目标, 我们首先应该反思我们的生活方式, 少购买衣服。)承接自然, 上文提出问题, 下

41、文回答问题。选项中的“the goal” 呼应上文的“avoid the environmental impact from the fashion industry”。故选F。. 完形填空(2021浦东高二检测)Processed foods like chips, soda and frozen pizzas are full of salt, sugar and fat. Now scientists are trying to understand if there is something else about such foods that may be bad for human

42、s. Scientists have already linked low-cost, 1foods to rising obesity rates around the world. Three recent studies offer more2on how our increasingly industrialized food supply may be affecting our health. What does processed food3? The researchers created a system that places foods into four groups.

43、 The system says highly processed foods are made4of industrialized materials and additives. Sodas, packaged cookies, instant noodles and chicken nuggets are some examples of highly processed foods. But also included are products that can5healthy, such as morning cereals, energy bars and some kinds o

44、f yogurt. Whats wrong with processed foods? Researchers at the National Institutes of Health conducted a four-week study involving 20 people. They found that people eat about 500 more calories a day when6mostly processed foods. That is compared with when the7people were given less processed foods. T

45、he researchers permitted the 20 participants to eat as much or as little as they wanted. They were taken to a medical center so their health and behavior could be 8. In another study, researchers in France found people who ate more processed foods were more likely to have heart disease. A similar st

46、udy in Spain linked eating more processed foods to a higher risk of death9. What is it about processed foods? When given less processed foods, people in the study10more of a hormone that controls hunger, and less of a hormone that causes hunger. The reason for the11is not clear. The scientists also

47、found that people ate processed foods more quickly. Kevin Hall is one of the researchers who led the study. He told the AP that processed foods are12softer and easier to chew and swallow. Hall noted the source of nutrients might13. For example, fiber from whole fruits and vegetables may be better fo

48、r making people feel full than fiber added to packaged foods such as energy bars and yogurt. What should you eat? Avoiding processed foods can be hard, 14for people with limited time and money. Processed foods can also take many forms. 15, companies continually re-engineer products to make them seem

49、 healthier. The newest studies may provide more reasons to avoid processed foods. But, they also call attention to the difficulty of coming up with ways to do that. 【文章大意】本文是说明文。科学家已经确定, 廉价的包装食品与全球不断上升的肥胖率有关。文章介绍了什么是加工食品, 加工食品有什么问题, 加工食品与什么有关以及人们应该吃什么。1. A. organicB. deliciousC. packagedD. cheap【解析】

50、选C。句意: 科学家已经确定, 廉价的包装食品与全球不断上升的肥胖率有关。 organic有机的; delicious美味的; packaged包装好的; cheap便宜的。根据下文的“rising obesity rates”可知, 这种食物与肥胖有关, 不可能是“有机的”和“美味的”, 空格前low-cost与cheap意思相近, C项“包装好的”符合题意, 说明不是新鲜食物。故选C。2. A. examplesB. cluesC. hintsD. signals【解析】选B。句意: 最近的三项研究为日益增加的工业化食品供应可能对人类健康产生何种影响提供了更多线索。 examples例子,

51、 榜样; clues线索; hints暗示; signals信号。根据下文内容的讲述可知, 研究提供了更多工业化食品影响人类健康的线索。故选B。3. A. provideB. suggestC. meanD. infer【解析】选C。句意: 什么是加工食品? provide提供; suggest建议; mean意味着; infer推断。黑体是下文的主题句, 根据下文的“Sodas, packaged cookies, instant noodles and chicken nuggets are some examples of highly processed foods. ”可知, 讲述的

52、是加工食品意味着什么, 即加工食品是什么? 故选C。4. A. speciallyB. mostlyC. naturallyD. technically【解析】选B。句意: 这一系统指出, 高度加工食品主要由工业材料和添加剂组成。 specially特别地; mostly大部分地; naturally自然地; technically技术上。根据空格前后文并结合常识可知, 高度加工食品主要由工业材料和添加剂组成。故选B。5. A. remainB. tasteC. becomeD. seem【解析】选D。句意: 但是也包括诸如早餐麦片、能量棒以及某些类型的酸奶等看起来健康的产品。remain仍旧

53、; taste品尝; become成为; seem似乎。根据“such as morning cereals, energy bars and some kinds of yogurt. ”可知, 此处说的是高度加工的不健康的食品, 因此推断是似乎健康的食品。故选D。6. A. providedB. forcedC. deprivedD. fed【解析】选D。句意: 他们发现, 饮食以加工食品为主的参与者每天会多摄入约500卡路里。provided提供; forced迫使; deprived剥夺; fed提供/吃食物。根据上文的“people eat about 500 more calori

54、es a day”和下文“processed foods”可推断, 此处指的是吃加工食品的人每天多摄入500卡热量。故选D。7. A. sameB. normalC. differentD. alternative【解析】选A。句意: 这是对同一个参与者食用较少加工食品的情况进行比较后得出的结论。same同样的; normal正常的; different不同的; alternative替代的。研究理应是对同一个人进行对比。故选A。8. A. explainedB. observedC. curedD. remedied【解析】选B。句意: 参与者被带到医疗中心, 对他们的健康和行为进行观察。e

55、xplained解释; observed观察; cured治愈; remedied改正; 纠正。根据上文“They were taken to a medical center”可知, 被带去医疗中心, 是对他们的健康和行为进行观察。故选B。9. A. in generalB. in particularC. in natureD. in advance【解析】选A。句意: 西班牙进行的一项类似研究指出, 一般情况下, 食用更多加工食品会导致死亡风险增加。in general通常; in particular特别; in nature实际上; in advance提前。此处是一项与上文研究相似

56、的研究, 结合上文可知食用更多加工食品的人更可能患上心脏疾病。可推断研究指出的是一般情况下, 食用更多加工食品会导致死亡风险增加。故选A。10. A. preferredB. producedC. comparedD. processed【解析】选B。句意: 食用少量加工食品时, 研究参与者会分泌更多控制饥饿的激素, 而引发饥饿的激素则会减少分泌。preferred更喜欢; produced生产; 产生; compared比较; processed加工。根据下文提到的“more of a hormone”可知, 研究参与者分泌更多控制饥饿的激素, produce“产生”符合语境。故选B。11.

57、 A. hungerB. procedureC. reactionD. physiology【解析】选C。句意: 这一反应的原因还不得而知。hunger饥饿; procedure程序; reaction反应; physiology生理技能。上文提到“食用少量加工食品时, 研究参与者会分泌更多控制饥饿的激素, 而引发饥饿的激素则会减少分泌”是参与者的反应。故选C。12. A. supposedlyB. hardlyC. usuallyD. constantly【解析】选C。句意: 他对美联社说, 加工食品通常更软、更容易咀嚼和吞咽。supposedly据说; hardly几乎不; usually

58、通常; constantly不断地。根据下文“softer and easier to chew and swallow. ”并结合常识可知, 加工食品通常更软、更容易咀嚼和吞咽。故选C。13. A. strike a balanceB. run a riskC. pose a threatD. make a difference【解析】选D。句意: 霍尔指出, 营养来源可能有所不同。 strike a balance公平处理; run a risk冒险; pose a threat构成威胁; make a difference有影响; 产生不同。根据下文可知, 比如, 与能量棒和酸奶等包装食

59、品中添加的纤维相比, 来自完整水果和蔬菜的纤维可能更容易使人们有饱腹感。可推断, 此处说的是营养来源不同, 故选D。14. A. especiallyB. generallyC. specificallyD. reasonably【解析】选A。句意: 不食用加工食品可能很难做到, 对时间和金钱有限的人来说尤其如此。especially特别地; generally普遍地; specifically明确地; reasonably合理地。根据下文可知, 时间和金钱有限的人更难避免食用加工食品。故选A。15. A. By contrastB. In summaryC. Above allD. In a

60、ddition【解析】选D。句意: 另外, 企业可以继续重新调整产品, 让产品看起来更健康。By contrast相比之下; In summary总的来说; Above all首要的是; In addition除此之外。由上下文可知加工食品可以有多种形式。企业可以继续重新调整产品, 让产品看起来更健康。是递进关系, 解释了企业应该怎么做。故选D。【补偿训练】阅读理解(2021石家庄高二检测)Imagine possessing something that you loved so much. Imagine what it would feel like if you lost it. Wh

61、ile that item may be something as simple as a toy, you would still feel very upset, but you could replace it with a new one. Now imagine losing something that you depend on for survival and cannot be replaced. That is what it would be like if we lose the natural environment around us. Firstly, I bel

62、ieve the environment should be protected because it supports human life. One of the largest examples is that we get all of our food and drinks from the environment. If the environment were to be destroyed beyond revival, then the human race would be over in months. Scientists have to find another pl

63、anet with similar conditions to the Earth, and if its found, we dont have the technology to get to that planet in time. Secondly, I believe that the environment serves as an amazing educational tool for students. When I was in second grade, I had an absolute interest in animals. When we had a field

64、trip to the Daggerwing Nature Center, I was very excited. When we got there, I could hardly believe what I was seeing. There was a bridge to get to the main building, and under the bridge was a small swamp (沼泽) with turtles, fish, and my personal favorite, alligators. I was so surprised that I almos

65、t ran into the tour guide. We walked into the building and saw various animals in their habitats. I was so inspired by this visit. Six years later, I have taken an animal behavior class for three weeks. Meeting by chance with the environment can inspire people, and if preserved, it will continue to

66、inspire people. In conclusion, the environment is so valuable because it cant be replaced, keeps us alive, and serves as a great educational tool. 【文章大意】本文是议论文。作者用最心爱的东西比喻环境的重要性, 接着从两个方面来论述环境的重要性: 环境是人们生存的保障, 是无法取代的; 环境也是一个很有价值的教育工具。1. The first paragraph leads to the theme of the text by_. A. descr

67、ibing a process. B. presenting differences. C. analyzing causes. D. showing similarities. 【解析】选D。推理判断题。根据文章第一段可知, 现在想象一下, 你失去了赖以生存、无法替代的东西。如果我们失去了周围的自然环境, 情况就会是这样。作者用失去最心爱的东西来比喻我们失去赖以生存的环境。因此判断出作者是以比喻类似的东西来引出话题的。故选D项。2. The underlined word “revival” in Paragraph 2 refers to_. A. health. B. recovery.

68、 C. range. D. survival. 【解析】选B。词义猜测题。根据画线词后的一句“then the human race would be over in months. (那么人类将在几个月内灭绝。)”, 可知, 前一句意指“环境遭到极为严重的破坏, 无法恢复”。因此可以推测, beyond revival 意思为“无法恢复, 不可挽回”, revival 意思为“恢复”。故选B项。3. Whats the function of Paragraph 3? A. To express the writers absolute interest in animals. B. To

69、introduce the Daggerwing Nature Centers scenery. C. To show the environment can inspire and educate people. D. To prove the subject he has chosen is promising. 【解析】选C。推理判断题。根据第三段的第二句和第三句作者讲述了自己二年级时到自然中心实地考察的经历。正是这次的实地考察之旅, 让作者深受鼓舞, 后来选修动物行为课。作者认为环境对学生来说是一个神奇的教育工具。因此判断出在第三段中作者是表明环境可以教育人们、激励人们。故选C项。4.

70、 Which of the following can be the best title for the text? A. Why the Environment Is So Important? B. Which Planet Can Replace the Earth? C. How People Should Protect the Environment? D. What People Can Do to Stop Pollution? 【解析】选A。主旨大意题。根据文章最后一段中“the environment is so valuable because it cant be replaced, keeps us alive, and serves as a great educational tool. ”, 作者认为环境是如此珍贵, 因为它是不可替代的, 是人类生存的保障, 并且是了不起的教育工具。因此作者是论述环境的重要性。文章标题应为“环境为什么很重要? ”故选A项。