人教版（2019）选择性必修第三册 Unit3 Environmental Protection Learning About Language and Using Language能力提升练（含解
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Unit3 Learning About Language and Using Language能力提升练
I.阅读理解
主题语境：人与自然 难易度：★★ 语篇类型：说明文 建议用时：6
（2020江西高安中学高二上期末）
Gases, like black carbon, methane（甲烷）and ozone（臭氧）in city smog, are called “short-lived climate pollutants（污染物）”, which exist both outdoors and indoors and decrease agricultural crops.
WHO says emissions from these climate pollutants cause many serious illnesses, including lung cancer. And these pollutants are responsible for many of the more than 7 million premature deaths each year that are connected to air pollution.
Maria Neira in WHO says the pollutants have a strong impact on climate change. But the good news is that they only stay in the atmosphere for a few days to 10 years. That is much shorter than carbon dioxide, a greenhouse gas that can remain for hundreds, or even thousands of years.
According to Maria Neira, when you address the short-lived pollutants, you can reduce emissions very rapidly, and then improve air quality. You will have an immediate reduction in the ill health and diseases because of the reduction of air pollution.
WHO has many available and affordable ways to reduce these short-lived climate pollutants. At the top of the list is cutting vehicle emissions by requiring higher emission and efficiency standards. More emissions are released when engines are running.
Indoor air pollution also contributes to poor health and premature death. WHO reports that nearly 3 billion low-income households rely on “dirty fuels”. Coal, wood and kerosene used for cooking and heating are examples. Cleaner and more efficient stoves and fuel alternatives could cut down on health risks.
Another way to cut back on these pollutants is to have more investment and policies for rapid transport. These include buses, trains, bicycles and pedestrian or walking routes. These investment could have many benefits, including safer travel, reduced health risks from noise and air pollution and more physical activity.
The WHO report also calls for encouraging high-income and middle-income populations to include more plant-based foods in their diets. It says this could the risk of developing reduce heart disease and some cancers, and could also slow the methane gas production that comes with some animal-sourced foods.
1. The “short-lived climate pollutants” are so called because ________.
A. they cause many to die young
B. they exist shorter than the greenhouse gas
C. they live indoors for a short time
D. they have a short effect on peoples health
2. The underlined word “address” in Paragraph 4 means “________”.
A. live on
B. talk about
C. deal with
D. turn to
3. What can be inferred from the whole passage
A. Rich people hardly ever eat plant-based foods in daily life.
B. No emissions are released from stopped engines.
C. Governments should take measures to fight pollution.
D. Heart disease and some cancers are caused by the pollutants.
4. Which of the following may be the best title of the text
A. The ways to fight air pollution
B. Reducing short-lived climate pollutants to save lives
C. Some sources of serious air pollution
D. A report on pollution from WHO
Ⅱ.完形填空
主题语境：人与自然 难易度：★★ 语篇类型：记叙文 建议用时：13
（2020山东潍坊高二期末）
When Laura Wood’s senior year began, she was expecting to talk to the usual handful of members in the Environmental Club of Scarborough. 1 , she found herself standing in front of 60 of her peers.
The year before Wood took over as 2 , the new club was still trying to establish itself. As the first meeting 3 , she worked hard to advertise that the club still existed and was looking for 4 members Her campaign worked. Sixty 5 showed up to hear what Wood would say about helping to improve the local environment.
“It was 6 ,” said Wood. “I really wasn’t 7 60 kids, you know, because last year there were only 10. We want to help purchase our school the first 8 minibus.”
Under Woods direction. the club suddenly started to grow 9 . Later, it opened the green bus bank account.
With the club, Wood also collected cans and paper both to raise more money and to help the school reduce 10 . This wasn’t always an easy job. Wood didn't just pick up 11 ; she sorted the useful waste out, sometimes after it had been 12 thrown away. “We’d be a little 13 most of the time in the afternoons,” said Wood.
By the end of the year they had been 14 about $60 a week by saving the cans and bottles.
This is what Wood usually goes about starting change: quietly but effectively. “She’s a 15 kid, said Principal Andrew Dolloff. “She just doesn’t do flashy（招摇的）things to get noticed.”
1. A. Therefore B. Instead C. Besides D. Anyhow
2. A. president B. teacher C. worker D. employer
3. A. announced B. suggested C. ended D. approached
4. A. old B. national C. new D. official
5. A. students B. experts C. professors D. cleaners
6. A. interesting B. exciting C. frustrating D. amusing
7. A. recognizing B. calling C. expecting D. counting
8. A. clean B. green C. safe D. fast
9. A. mentally B. physically C. politically D. financially
10. A. waste B. cost C. pressure D. problems
11. A. recycling B. learning C. practicing D. funding
12. A. clearly B. hurriedly C. deliberately D. mistaken
13. A. crazy B. healthy C. smelly D. busy
14. A. losing B. averaging C. counting D. paying
15. A. strange B. silly C. lovely D. great
Ⅲ.语法填空
主题语境：人与自然 难易度：★★ 语篇类型：说明文 建议用时：7
（2019辽宁沈阳东北育才学校高二月考）
Polar bears are undergoing hunger in a world 1 (warm) than ever before.
Polar bears live in the environment too cold for most animals. For most of the year, they live and hunt on Arctic sea ice. Nature has prepared 2 (they) for the cold conditions. But nothing has prepared the bears for the danger 3 threatens their only home.
Polar bears’ world is melting. Studies show that polar ice 4 (reduce) by 9.8% every 10 years since 1978. Now about 20, 000 to 25,000 polar bears live in the Arctic. Polar bears depend 5 sea ice for their 6 (survive). “Sea ice is more than just the platform that the bears walk over,” says Andrew Derocher, 7 scientist who studies North American polar bear populations. “Without it, they can’t exist.”
8 (melt) and refreezing of polar ice is natural. But in a warmer world, the cycle speeds up, and polar bears have less time 9 (hunt). Normally, they have three months in the spring when they gain more weight. The extra fat will be used when the bears are not 10 (active) hunting.
1. ________ 2. ________ 3. ________ 4. ________ 5. ________
参考答案：
I.语篇解读 本文是一篇说明文。文章介绍了什么是“短期气候污染物”，它们会给人类带来的危害以及可以减少这些污染物排放的方法。
1.B【解析】细节理解题。由文章第三段中的 But the good news is that they only stay in the atmosphere for a few days to 10 years. That is much shorter than carbon dioxide，a greenhouse gas that can remain for hundreds，or even thousands of years.可知，“短期气候污染物”是由于它们在空气中存在的时间比温室气体短而得此名。故选B。
2.C【解析】词义猜测题。由画线单词后的 you can reduce emissions very rapidly, and then improve air quality. You will have an immediate reduction in the ill health and diseases because of the reduction of air pollution可知，这是解决掉“短期气候污染物”的结果。由此可推知，画线单词的意思是“处理掉，解决掉”。live on以……为食；talk about谈论；deal with处理，应付；tum to转向。故选C。
3.C【解析】推理判断题。由第五段中的 cutting vehicle emissions by requiring higher…standards以及倒数第二段中的 Another way to cut back on these pollutants is to have more investment and policies for rapid transport.可推知，政府应该采取一些措施来治理污染问题。故选C。
4.B【解析】主旨大意题。这是一篇说明文，文章前三段介绍了什么是短期气候污染物”以及它们会给人类带来的危害，剩下的五段内容提出了解决方案。只有选项B中的“short-lived climate pollutants"可与本文主题“ ‘短期气候污染物’ ”呼应，其中的Reducing也与最后几个段落中的解决方案呼应。故选B。
【高频词汇】1. be responsible for对……负责；是……的原因
2. atmosphere n.大气；空气；气氛3. available adj.可获得的4. affordable adj.负担得起的5. investment n.投资；投入
Ⅱ.语篇解读 本文是一篇记叙文。Wood是学校环保俱乐部的主席，该俱乐部回收垃圾，并打算筹资为学校买一辆小型环保公共汽车。
1.B【解析】结合第三段中Wood所说的话可知，她本来以为会员会寥寥无几，但没想到会员竟达到了60个。此处表示转折，故用Instead，表示“相反”。
2.A【解析】根据该空前的 took over以及第四段中的 Under Wood’s direction可知，Wood成了该俱乐部的主席，故用 president。
3.D【解析】结合常识和第二段可知，此处表示当第一次会议就要来临（approached）的时候，她尽力为俱乐部进行宣传。
4.C【解析】根据语境可知，此处表示俱乐部正在招募新（new）会员。
5.A【解析】根据文章第一句可知，wood是个学生。再结合文中多次出现的 school可知，前来听wood讲话的是俱乐部招募的学生（students）会员。
6.B【解析】根据本段内容可知，这次学生们非常踊跃，前来参加会议的人很多，Wood没有想到有这么多人，由此推知此处表示wood说“这是令人兴奋的（exciting）”。
7.C【解析】结合该段中Wood所说的话可知，她没有预料到（expecting）会有这么多同学参与。文章第一句中的expecting也给出了提示。
8.B【解析】根据Wood发起的是环保运动可知，她想帮助学校买一辆环保的（green）小型公共汽车。
9.D【解析】因为参与的人数剧增，俱乐部在财力方面（financially）突然开始增长，所以才有了下一句中提到的银行账户的建立。
10.A【解析】结合语境和常识可知，收集罐子和纸是为了筹资并帮助学校减少浪费（waste）。
11.A【解析】她不仅仅回收（recycling）垃圾，还把垃圾里面有用的东西挑选出来。
12.D【解析】该空前的it指代垃圾中有用的东西。有时这些东西是被人们误扔的，故用 mistakenly（错误地）。
13.C【解析】因为需要分拣垃圾，所以他们身上有些难闻。smelly有难闻气味的。
14.B【解析】由该空后的 about $60 a week及语境可知他们平均每星期赚约60美元。average在此处为动词，表示“平均为…”。
15.D【解析】根据最后一段中对Wood的评价可知，她很务实，从不哗众取宠，因此 Andrew Dolloff说她是一个了不起的（great）孩子。
【高频词汇】1. establish ⅵ.确立；使立足；使稳固；建立；创立；设立2. purchase vt.购买3. account n.账户；账目4. effectively adv.有效地
Ⅲ.语篇解读 本文是一篇说明文。北极熊生活在寒冷的北极地区，但是它们生活的地方正在慢慢融化。研究显示，自1978年以来，极地冰每10年减少9.8%。一位科学家认为，如果没有海冰，北极熊将无法生存。
1. warmer【解析】考查比较级。句意：在一个比以往任何时候都更温暖的世界里，北极熊正在遭受饥饿。修饰名词 world，用形容词，由后面的than可知，应用比较级 warmer。
2. them【解析】考查代词。句意：大自然使它们为寒冷的条件做好了准备。设空处作 prepared的宾语，指前面提到的 Polar bears，故用them。
3. that/which【解析】考查定语从句。句意：但是，北极熊对威胁它们唯一的家园的危险毫无准备。所填词引导定语从句，关系词在从句中作主语，先行词是 the danger，指物，故用that或which。
4. has reduced【解析】考查动词的时态及主谓一致。句意：研究表明，自1978年以来，极地冰每10年减少9.8%。由 since1978可知，句子应用现在完成时；此处主语是 polar ice，中心词ice为不可数名词，故填 has reduced。
5. on/upon【解析】考查介词。句意：北极熊依靠海冰生存。depend on/upon意为“依靠，依赖”，是固定搭配。
6. survival【解析】考查词性转换。前面有形容词性物主代词修饰，故用名词 surviva，表示“生存，存活”。
7. a【解析】考查冠词。句意：一位研究北美洲的北极熊数量的科学家Andrew Derocher说……。此处泛指“一个科学家”，且scientist以辅音音素开头，应用不定冠词a。
8. Melting【解析】考查动名词。句意：极地冰的融化和再冻结是自然的。此处为动名词短语作主语，and连接两个并列成分，由refreezing可知，用动名词 Melting。
9. to hunt【解析】考查非谓语动词。句意：但在一个更温暖的世界里，这种循环会加速，北极熊捕猎的时间就会更少。此处表示“北极熊捕猎的时间更少”，用不定式作定语。
10. actively【解析】考查副词。句意：当北极熊不积极捕猎的时候，多余的脂肪将被利用。修饰动词 hunting，作状语，意为“积极地”，用副词。
【高频词汇】1. platform n.平台2. speed up加速3. gain vt.增加；获得
长难句分析
原句 “Sea ice is more than just the platform that the bears walk over,” says Andrew Derocher, a scientist who studies North American polar bear populations. “Without it, they can’t exist.”
句意 一位研究北美洲的北极熊数量的科学家 Andrew Derocher说：“海冰不仅仅是北极熊在上面行走的平台，没有海冰，它们就不能存活。”
分析 句中的 more than意思为“不只是，不仅仅是”。that the bears walk over是一个定语从句，修饰先行词platform。
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I.阅读理解
主题语境：人与自然 难易度：★★ 语篇类型：说明文 建议用时：6
（2020江西高安中学高二上期末）
Gases, like black carbon, methane（甲烷）and ozone（臭氧）in city smog, are called “short-lived climate pollutants（污染物）”, which exist both outdoors and indoors and decrease agricultural crops.
WHO says emissions from these climate pollutants cause many serious illnesses, including lung cancer. And these pollutants are responsible for many of the more than 7 million premature deaths each year that are connected to air pollution.
Maria Neira in WHO says the pollutants have a strong impact on climate change. But the good news is that they only stay in the atmosphere for a few days to 10 years. That is much shorter than carbon dioxide, a greenhouse gas that can remain for hundreds, or even thousands of years.
According to Maria Neira, when you address the short-lived pollutants, you can reduce emissions very rapidly, and then improve air quality. You will have an immediate reduction in the ill health and diseases because of the reduction of air pollution.
WHO has many available and affordable ways to reduce these short-lived climate pollutants. At the top of the list is cutting vehicle emissions by requiring higher emission and efficiency standards. More emissions are released when engines are running.
Indoor air pollution also contributes to poor health and premature death. WHO reports that nearly 3 billion low-income households rely on “dirty fuels”. Coal, wood and kerosene used for cooking and heating are examples. Cleaner and more efficient stoves and fuel alternatives could cut down on health risks.
Another way to cut back on these pollutants is to have more investment and policies for rapid transport. These include buses, trains, bicycles and pedestrian or walking routes. These investment could have many benefits, including safer travel, reduced health risks from noise and air pollution and more physical activity.
The WHO report also calls for encouraging high-income and middle-income populations to include more plant-based foods in their diets. It says this could the risk of developing reduce heart disease and some cancers, and could also slow the methane gas production that comes with some animal-sourced foods.
1. The “short-lived climate pollutants” are so called because ________.
A. they cause many to die young
B. they exist shorter than the greenhouse gas
C. they live indoors for a short time
D. they have a short effect on peoples health
2. The underlined word “address” in Paragraph 4 means “________”.
A. live on
B. talk about
C. deal with
D. turn to
3. What can be inferred from the whole passage
A. Rich people hardly ever eat plant-based foods in daily life.
B. No emissions are released from stopped engines.
C. Governments should take measures to fight pollution.
D. Heart disease and some cancers are caused by the pollutants.
4. Which of the following may be the best title of the text
A. The ways to fight air pollution
B. Reducing short-lived climate pollutants to save lives
C. Some sources of serious air pollution
D. A report on pollution from WHO
Ⅱ.完形填空
主题语境：人与自然 难易度：★★ 语篇类型：记叙文 建议用时：13
（2020山东潍坊高二期末）
When Laura Wood’s senior year began, she was expecting to talk to the usual handful of members in the Environmental Club of Scarborough. 1 , she found herself standing in front of 60 of her peers.
The year before Wood took over as 2 , the new club was still trying to establish itself. As the first meeting 3 , she worked hard to advertise that the club still existed and was looking for 4 members Her campaign worked. Sixty 5 showed up to hear what Wood would say about helping to improve the local environment.
“It was 6 ,” said Wood. “I really wasn’t 7 60 kids, you know, because last year there were only 10. We want to help purchase our school the first 8 minibus.”
Under Woods direction. the club suddenly started to grow 9 . Later, it opened the green bus bank account.
With the club, Wood also collected cans and paper both to raise more money and to help the school reduce 10 . This wasn’t always an easy job. Wood didn't just pick up 11 ; she sorted the useful waste out, sometimes after it had been 12 thrown away. “We’d be a little 13 most of the time in the afternoons,” said Wood.
By the end of the year they had been 14 about $60 a week by saving the cans and bottles.
This is what Wood usually goes about starting change: quietly but effectively. “She’s a 15 kid, said Principal Andrew Dolloff. “She just doesn’t do flashy（招摇的）things to get noticed.”
1. A. Therefore B. Instead C. Besides D. Anyhow
2. A. president B. teacher C. worker D. employer
3. A. announced B. suggested C. ended D. approached
4. A. old B. national C. new D. official
5. A. students B. experts C. professors D. cleaners
6. A. interesting B. exciting C. frustrating D. amusing
7. A. recognizing B. calling C. expecting D. counting
8. A. clean B. green C. safe D. fast
9. A. mentally B. physically C. politically D. financially
10. A. waste B. cost C. pressure D. problems
11. A. recycling B. learning C. practicing D. funding
12. A. clearly B. hurriedly C. deliberately D. mistaken
13. A. crazy B. healthy C. smelly D. busy
14. A. losing B. averaging C. counting D. paying
15. A. strange B. silly C. lovely D. great
Ⅲ.语法填空
主题语境：人与自然 难易度：★★ 语篇类型：说明文 建议用时：7
（2019辽宁沈阳东北育才学校高二月考）
Polar bears are undergoing hunger in a world 1 (warm) than ever before.
Polar bears live in the environment too cold for most animals. For most of the year, they live and hunt on Arctic sea ice. Nature has prepared 2 (they) for the cold conditions. But nothing has prepared the bears for the danger 3 threatens their only home.
Polar bears’ world is melting. Studies show that polar ice 4 (reduce) by 9.8% every 10 years since 1978. Now about 20, 000 to 25,000 polar bears live in the Arctic. Polar bears depend 5 sea ice for their 6 (survive). “Sea ice is more than just the platform that the bears walk over,” says Andrew Derocher, 7 scientist who studies North American polar bear populations. “Without it, they can’t exist.”
8 (melt) and refreezing of polar ice is natural. But in a warmer world, the cycle speeds up, and polar bears have less time 9 (hunt). Normally, they have three months in the spring when they gain more weight. The extra fat will be used when the bears are not 10 (active) hunting.
1. ________ 2. ________ 3. ________ 4. ________ 5. ________
参考答案：
I.语篇解读 本文是一篇说明文。文章介绍了什么是“短期气候污染物”，它们会给人类带来的危害以及可以减少这些污染物排放的方法。
1.B【解析】细节理解题。由文章第三段中的 But the good news is that they only stay in the atmosphere for a few days to 10 years. That is much shorter than carbon dioxide，a greenhouse gas that can remain for hundreds，or even thousands of years.可知，“短期气候污染物”是由于它们在空气中存在的时间比温室气体短而得此名。故选B。
2.C【解析】词义猜测题。由画线单词后的 you can reduce emissions very rapidly, and then improve air quality. You will have an immediate reduction in the ill health and diseases because of the reduction of air pollution可知，这是解决掉“短期气候污染物”的结果。由此可推知，画线单词的意思是“处理掉，解决掉”。live on以……为食；talk about谈论；deal with处理，应付；tum to转向。故选C。
3.C【解析】推理判断题。由第五段中的 cutting vehicle emissions by requiring higher…standards以及倒数第二段中的 Another way to cut back on these pollutants is to have more investment and policies for rapid transport.可推知，政府应该采取一些措施来治理污染问题。故选C。
4.B【解析】主旨大意题。这是一篇说明文，文章前三段介绍了什么是短期气候污染物”以及它们会给人类带来的危害，剩下的五段内容提出了解决方案。只有选项B中的“short-lived climate pollutants"可与本文主题“ ‘短期气候污染物’ ”呼应，其中的Reducing也与最后几个段落中的解决方案呼应。故选B。
【高频词汇】1. be responsible for对……负责；是……的原因
2. atmosphere n.大气；空气；气氛3. available adj.可获得的4. affordable adj.负担得起的5. investment n.投资；投入
Ⅱ.语篇解读 本文是一篇记叙文。Wood是学校环保俱乐部的主席，该俱乐部回收垃圾，并打算筹资为学校买一辆小型环保公共汽车。
1.B【解析】结合第三段中Wood所说的话可知，她本来以为会员会寥寥无几，但没想到会员竟达到了60个。此处表示转折，故用Instead，表示“相反”。
2.A【解析】根据该空前的 took over以及第四段中的 Under Wood’s direction可知，Wood成了该俱乐部的主席，故用 president。
3.D【解析】结合常识和第二段可知，此处表示当第一次会议就要来临（approached）的时候，她尽力为俱乐部进行宣传。
4.C【解析】根据语境可知，此处表示俱乐部正在招募新（new）会员。
5.A【解析】根据文章第一句可知，wood是个学生。再结合文中多次出现的 school可知，前来听wood讲话的是俱乐部招募的学生（students）会员。
6.B【解析】根据本段内容可知，这次学生们非常踊跃，前来参加会议的人很多，Wood没有想到有这么多人，由此推知此处表示wood说“这是令人兴奋的（exciting）”。
7.C【解析】结合该段中Wood所说的话可知，她没有预料到（expecting）会有这么多同学参与。文章第一句中的expecting也给出了提示。
8.B【解析】根据Wood发起的是环保运动可知，她想帮助学校买一辆环保的（green）小型公共汽车。
9.D【解析】因为参与的人数剧增，俱乐部在财力方面（financially）突然开始增长，所以才有了下一句中提到的银行账户的建立。
10.A【解析】结合语境和常识可知，收集罐子和纸是为了筹资并帮助学校减少浪费（waste）。
11.A【解析】她不仅仅回收（recycling）垃圾，还把垃圾里面有用的东西挑选出来。
12.D【解析】该空前的it指代垃圾中有用的东西。有时这些东西是被人们误扔的，故用 mistakenly（错误地）。
13.C【解析】因为需要分拣垃圾，所以他们身上有些难闻。smelly有难闻气味的。
14.B【解析】由该空后的 about $60 a week及语境可知他们平均每星期赚约60美元。average在此处为动词，表示“平均为…”。
15.D【解析】根据最后一段中对Wood的评价可知，她很务实，从不哗众取宠，因此 Andrew Dolloff说她是一个了不起的（great）孩子。
【高频词汇】1. establish ⅵ.确立；使立足；使稳固；建立；创立；设立2. purchase vt.购买3. account n.账户；账目4. effectively adv.有效地
Ⅲ.语篇解读 本文是一篇说明文。北极熊生活在寒冷的北极地区，但是它们生活的地方正在慢慢融化。研究显示，自1978年以来，极地冰每10年减少9.8%。一位科学家认为，如果没有海冰，北极熊将无法生存。
1. warmer【解析】考查比较级。句意：在一个比以往任何时候都更温暖的世界里，北极熊正在遭受饥饿。修饰名词 world，用形容词，由后面的than可知，应用比较级 warmer。
2. them【解析】考查代词。句意：大自然使它们为寒冷的条件做好了准备。设空处作 prepared的宾语，指前面提到的 Polar bears，故用them。
3. that/which【解析】考查定语从句。句意：但是，北极熊对威胁它们唯一的家园的危险毫无准备。所填词引导定语从句，关系词在从句中作主语，先行词是 the danger，指物，故用that或which。
4. has reduced【解析】考查动词的时态及主谓一致。句意：研究表明，自1978年以来，极地冰每10年减少9.8%。由 since1978可知，句子应用现在完成时；此处主语是 polar ice，中心词ice为不可数名词，故填 has reduced。
5. on/upon【解析】考查介词。句意：北极熊依靠海冰生存。depend on/upon意为“依靠，依赖”，是固定搭配。
6. survival【解析】考查词性转换。前面有形容词性物主代词修饰，故用名词 surviva，表示“生存，存活”。
7. a【解析】考查冠词。句意：一位研究北美洲的北极熊数量的科学家Andrew Derocher说……。此处泛指“一个科学家”，且scientist以辅音音素开头，应用不定冠词a。
8. Melting【解析】考查动名词。句意：极地冰的融化和再冻结是自然的。此处为动名词短语作主语，and连接两个并列成分，由refreezing可知，用动名词 Melting。
9. to hunt【解析】考查非谓语动词。句意：但在一个更温暖的世界里，这种循环会加速，北极熊捕猎的时间就会更少。此处表示“北极熊捕猎的时间更少”，用不定式作定语。
10. actively【解析】考查副词。句意：当北极熊不积极捕猎的时候，多余的脂肪将被利用。修饰动词 hunting，作状语，意为“积极地”，用副词。
【高频词汇】1. platform n.平台2. speed up加速3. gain vt.增加；获得
长难句分析
原句 “Sea ice is more than just the platform that the bears walk over,” says Andrew Derocher, a scientist who studies North American polar bear populations. “Without it, they can’t exist.”
句意 一位研究北美洲的北极熊数量的科学家 Andrew Derocher说：“海冰不仅仅是北极熊在上面行走的平台，没有海冰，它们就不能存活。”
分析 句中的 more than意思为“不只是，不仅仅是”。that the bears walk over是一个定语从句，修饰先行词platform。
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