单选题请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration,

题目

单选题

请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration, more imprisonment, and so on.The real answer is almost certainly a combination of these factors, rather than one of them to the exclusion of the rest. But a new paper adds a surprising variable to the mix. What if the decline of crime in America started with the decline of cash?Cash is critical to the health of an underground economy, because it's anonymous, nearly untraceable, and easily stolen. This makes it the lifeblood of the black market.But Americans are rapidly abandoning cash thanks to credit cards, debit cards, and mobile payments. Half a century ago, cash was used in 80 percent of U.S. payments. Now that figure is about 50 percent, according to researchers.In the 1980s, the federal government switched from paper money to electronic benefit transfers. They didn't switch all at once. They switched one county at a time within states. This created a kind of randomly controlled environment for the researchers, who studied Missouri's counties to establish whether the areas that switched from welfare cash to electronic transfers saw a concurrent decline in crime.The results were striking: The shift away from cash was associated with a sigpificant decrease in the overall crime rate and the specific offenses of burglary and assault in Missouri and a decline in arrests. In other words, the counties saw a decline in specific crimes when they switched away from cash welfare.Perhaps most interestingly, they found that the switch to electronic transfers reduced robbery but not rape, suggesting that the move away from cash only had an impact on crime related to getting and spending cash.The move toward cashlessness in the U.S. continues quickly. Google now lets you attach money to emails to send to friends, which means that for some shoppers, pulling out your credit card could become as rare as finding exact change in your coin purse. It might seem absurd to imagine Visa, Square, and Google Wallet as crime-fighting technologies. But with a better understanding of how cash's availability affects crime, perhaps the government should consider killing more than just the penny.Which of the following cannot explain why cash is critical to the health of an underground economy?

Cash is anonymous.

Cash is hardly traceable.

Cash is easily stolen.

Cash is the lifeblood of the black market.

相似考题

1.According to the passage, downshifting emerged in the U.S. as a result of _______ .A the quick pace of modern lifeB man's adventurous spiritC man's search for mythical experiencesD the economic situation

2.请教:2005年12月大学英语三级考试真题第1大题第3小题如何解答?【题目描述】第3题：According to this passage, gestures are__________A. spoken words B. a non-language elementC. pictures in a language D. written language

3.The best title for this passage is ______.A. Crime--A Grave Problem in the WestB. Chevrolet--A Make of an Old CarC. Computer--A Powerful Aid in Fighting Against CrimeD. Police--A Useful Force in the Fight Against Crime

4.阅读下面一段课文，回答下列 21～23 小题。第 21 题解释这段文字中加点字的含义。暗：穿：

参考答案和解析

正确答案： A

解析：

更多“请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S.”相关问题

第1题：

According to the passage, immigrants choose to settle in the U.S., dreaming that _____________.

A. they will make a fortune overnight there
B. they can be more competitive in business
C. they can start profitable businesses there
D. they will find better chances of employment

正确答案：D
第2题：

请教:2011年会计从业资格考试《初级电算化》试题二第1大题第21小题如何解答?

【题目描述】

21. 日期1900年1月25日在Excel系统内部储存的是（）

A.25

B.1,25,00

C.1-25-00

D.00,1,25

正确答案：A

答案分析：

因为EXCEL是从1900-1-1开始计算的

因为EXCEL是从1990-1-1开始计算的

A 25因为EXCEL是从1900-1-1开始计算的
第3题：

What could be the most appropriate title for the passage？( )

A.Cyber Crime and Its Prevention
B.The Origin of Cyber Crime
C.How to Deal with Cyber Crime
D.The Definition of Cyber Crime

答案：A
解析：
主旨题。本文第一、二段简要地描述了“网络空间”一词的起源并概述了互联网的发展，第三、四段主要讲述互联网的潜在风险，五至八段讲如何抵御风险。A项能较好地概括，其余三项都只描述了其中一个方面。因此A项作为文章标题更加恰当。故本题选A。参考译文：“网络空间”一词是由科幻作家威廉·吉布森提出的。1982年，他第一次在短篇小说中使用该词，几年后，在小说《神经漫游者》中，吉布森对其进行了扩展，小说的主角亨利·多塞特·凯斯是一名陷入困境的电脑黑客和吸毒者。吉布森在书中将网络空间描述为“数十亿合法运营商每天都在经历的交感的幻觉”，以及“从人类系统中每台计算机的数据库中提取的数据的图形展示”。事实证明，他的文学创作非常有先见之明。网络空间已经成为计算设备、网络、光纤电缆、无线连接和其他基础设施的象征，它们为全球数十亿人带来了互联网。这些技术形成的无数联系为所有每日使用网络来挖掘人类集体知识宝库的人带来了巨大好处。但是这项非凡的发明也有不好的一面。数据泄露变得越来越广泛，越来越普遍。去年，由于网络遭到攻击，超过8亿条记录丢失。最近最突出的受害者之一是美国大型零售商塔吉特百货，其首席执行官格雷戈·斯坦哈夫尔在披露黑客窃取了数百万客户的网络数据的几个月后，于5月辞职。这些数据包括信用卡和借记卡的详细信息。其他知名公司，如技术公司奥多比和在线市场易趣，也受到了冲击。然而，潜在的危害远不止这种商业入侵。美国国家安全局(NSA)承包商爱德华斯诺登(Edward Snowden)对西方情报机构大规模曝光监控录像，越来越多视网络空间为新战争领域的国家招募“互联网斗士”，引发了更广泛的担忧。保护网络空间是一件很难的事，因为互联网的架构是为了促进联通，而不是安全。发明互联网的人只考虑过可行性，并未考虑其可能受到的风险，因为它隶属美国军方。随着黑客的出现，人类从安装防毒软件到设置防火墙，想尽了办法试图阻止它们。总的来说，这些防御措施相当有效。尽管人们一直在谈论“网络9·11”风险，但事实证明，互联网具有很强的恢复力。数亿人每天打开电脑，进行网上交易，逛虚拟商店，在社交网络上与朋友交换八卦和照片，并在网上发送各种敏感数据，却不会产生不良影响。公司和政府正在转移越来越多的在线服务。但是任务变得越来越难了。涉及保护数据和人员的网络安全面临多重威胁，尤其是在网络犯罪和在线工业间谍活动方面。有很多方法可以让我们更加安全，一是确保组织获得网络安全的基础知识。很多情况往往是由简单的失误造成的，例如未能将包含敏感数据的系统与无需访问它们的系统分开。公司还需要更好地预测攻击可能来自哪里，并快速调整防御机制以应对新的威胁。技术也可以有所帮助，允许企业相互分享风险情报的行业举措也有所帮助。不仅如此，还需要采取激励措施加强网络安全。一种方法是鼓励互联网服务提供商或管理互联网连接的公司承担更多的责任来识别和帮助清理被恶意软件感染的计算机。另一种是找到方法，确保软件开发人员写出的代码缺陷更少，这样黑客可利用的安全漏洞就会更少。
第4题：

单选题
Which of the following best describes the relationship between Passage 1 and Passage 2?
A
Passage 2 offers a criticism of the political theory outlined in Passage 1.
B
Passage 1 expands upon an argument made in Passage 2.
C
Passage 1 refutes the conclusion drawn in Passage 2.
D
Passage 2 offers a balanced counterpoint to the biased opinions expressed in Passage 1
E
Passage I offers evidence to support the main idea of Passage 2.

正确答案： E
解析：
第一篇文章简短地描述了遏制政策。第二篇文章主要讲的是美国之所以没能稳定越南局势是因为美国使用了遏制政策。A项最好的解释了两篇文章的关系。
第5题：

单选题
Which of the following has the closest meaning to the underlined word “opportunity” in this passage?
A
Reward.
B
Interest.
C
Ability.
D
Chance.

正确答案： D
解析：
【语篇解读】这是一篇记叙文。Polly阿姨让Tom把房屋门前的栅栏刷上油漆，他使出一个伎俩把这个累人的活交给了其他的孩子们来完成。最终，他发现了一个事实：人们总是对没拥有的东西或不应做的事情充满兴趣。
词义猜测题。reward报酬；interest兴趣；ability能力；chance机会。根据上下文并结合选项，可猜测opportunity的意思是“机会”。
第6题：

单选题
It can he learnt from the passage that Cubism has something to do with _____.
A
architecture
B
Renaissance
C
geography
D
geometry

正确答案： A
解析：
文中第三段在谈立体派的特点时指出“In Cubism, natural forms were broken down analytically into geometric shapes”，在立体画派中，自然形状被分析地破解为几何形状。故答案为D。
第7题：

单选题
请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration, more imprisonment, and so on.The real answer is almost certainly a combination of these factors, rather than one of them to the exclusion of the rest. But a new paper adds a surprising variable to the mix. What if the decline of crime in America started with the decline of cash?Cash is critical to the health of an underground economy, because it's anonymous, nearly untraceable, and easily stolen. This makes it the lifeblood of the black market.But Americans are rapidly abandoning cash thanks to credit cards, debit cards, and mobile payments. Half a century ago, cash was used in 80 percent of U.S. payments. Now that figure is about 50 percent, according to researchers.In the 1980s, the federal government switched from paper money to electronic benefit transfers. They didn't switch all at once. They switched one county at a time within states. This created a kind of randomly controlled environment for the researchers, who studied Missouri's counties to establish whether the areas that switched from welfare cash to electronic transfers saw a concurrent decline in crime.The results were striking: The shift away from cash was associated with a sigpificant decrease in the overall crime rate and the specific offenses of burglary and assault in Missouri and a decline in arrests. In other words, the counties saw a decline in specific crimes when they switched away from cash welfare.Perhaps most interestingly, they found that the switch to electronic transfers reduced robbery but not rape, suggesting that the move away from cash only had an impact on crime related to getting and spending cash.The move toward cashlessness in the U.S. continues quickly. Google now lets you attach money to emails to send to friends, which means that for some shoppers, pulling out your credit card could become as rare as finding exact change in your coin purse. It might seem absurd to imagine Visa, Square, and Google Wallet as crime-fighting technologies. But with a better understanding of how cash's availability affects crime, perhaps the government should consider killing more than just the penny.The shift away from cash in Missouri's counties resulted in ____.
A
an unobvious decrease in the overall crime rate
B
a decrease in certain crimes such as robbery and rape
C
a decline in crimes related to the use ofcash
D
a decline in overall crimes

正确答案： A
解析：
第8题：

单选题
The passage is mainly about ______.
A
gay marriage
B
gay divorce
C
human rights
D
the infamous crime against nature

正确答案： B
解析：
该段录音首先介绍了1987年最高法院关于反对同性恋行为的判决和首席法官对该判决的支持，接着录音中描述了20年后美国马萨诸塞州最高法院宣布同性恋者结婚合法及产生的反响，最后录音描述了保守派所采取的行动，由此可见该段录音主要与同性恋婚姻有关。
第9题：

单选题
The author has written the passage mainly for ______.
A
general readers
B
power brokers
C
economists
D
decision makers

正确答案： A
解析：
由于作者认为降低人口增长率这一问题必须依靠个人的决定和行动，因此该篇文章的受众应该是一般的读者。
第10题：

单选题
请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration, more imprisonment, and so on.The real answer is almost certainly a combination of these factors, rather than one of them to the exclusion of the rest. But a new paper adds a surprising variable to the mix. What if the decline of crime in America started with the decline of cash?Cash is critical to the health of an underground economy, because it's anonymous, nearly untraceable, and easily stolen. This makes it the lifeblood of the black market.But Americans are rapidly abandoning cash thanks to credit cards, debit cards, and mobile payments. Half a century ago, cash was used in 80 percent of U.S. payments. Now that figure is about 50 percent, according to researchers.In the 1980s, the federal government switched from paper money to electronic benefit transfers. They didn't switch all at once. They switched one county at a time within states. This created a kind of randomly controlled environment for the researchers, who studied Missouri's counties to establish whether the areas that switched from welfare cash to electronic transfers saw a concurrent decline in crime.The results were striking: The shift away from cash was associated with a sigpificant decrease in the overall crime rate and the specific offenses of burglary and assault in Missouri and a decline in arrests. In other words, the counties saw a decline in specific crimes when they switched away from cash welfare.Perhaps most interestingly, they found that the switch to electronic transfers reduced robbery but not rape, suggesting that the move away from cash only had an impact on crime related to getting and spending cash.The move toward cashlessness in the U.S. continues quickly. Google now lets you attach money to emails to send to friends, which means that for some shoppers, pulling out your credit card could become as rare as finding exact change in your coin purse. It might seem absurd to imagine Visa, Square, and Google Wallet as crime-fighting technologies. But with a better understanding of how cash's availability affects crime, perhaps the government should consider killing more than just the penny.It can be learned from the last paragraph that ____.
A
the government is advised to advocate cashless payments
B
America has become a cashless society
C
most people now send their friends money by email
D
it is absurd to fight against crime by using Visa, Square, and Google Wallet

正确答案： A
解析：
第11题：

单选题
Which of the following best describes the relationship between the two passages?
A
Passage 2 describes a significant. and discovery that contradicts the argument of Passage 1.
B
Passage 2 offers a theory that supports the main point in Passage 1.
C
Passage I provides a possible reason for the scientific inquiry presented in Passage 2.
D
Passage 1 relates an anecdote that explains the popular misconception in Passage 2.
E
Passage 2 provides a historical context for the discovery described in Passage 1.

正确答案： D
解析：
第一篇文章主要讲到工具的创造是人类发展史上很重要的一步。第二篇文章主要描述了一项重大发现，即人类什么时候开始创造工具的的。C项最好地将两篇文章的关系表现出来了，第一篇文章提到工具创造对人类进化有很大的影响，第二篇文章继而对第一篇文章提出的问题作进一步研究，故选C项。
第12题：

单选题
It can be learned from the passage that in the U.S., _____.
A
there is a shortage of geriatric physicians
B
more training is needed for geriatric physicians
C
demand for geriatric physicians varies across states
D
care for the elderly will depend more on geriatric physicians

正确答案： A
解析：
第五段说在美国80万医生中只有约7000名老年医学专家。为使老年人得到充分地照顾，现在还需要13000名老年病医生。到2030年，老年病医生缺口将达到36000。
第13题：

A rite of passage is an activity that ___ a change in a person’s life.

A. signals
B. gives
C. marks
D. has

正确答案：C
第14题：

请阅读Passage l。完成第21—25小题。
Passage 1
It's one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is hard-wired into a mouse s brain.
But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to"cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature.
The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women--it is linked to blindness and the death of unborn babies.
However, the parasite's effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine(尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.
But that's not all. The parasite was found to be more powerful than originally thought—even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell,which could indicate that the infection has caused a permanent change in mice's brains.
Why does a parasite change a mouse's brain instead of making it sick like it does to humans?
The answer lies in evolution.
"It's exciting scary to know how a parasite can manipulate a mouse's brain this way," Ingram said. But she also finds it inspiring."Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away."
She said, but this study has proven that wrong."This may have huge implications for infectious disease medicine."

The passage is mainly about__________.
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A．mice' s inborn terror of cats
B．the evolution of Toxoplasma
C．a new study about the effects of a parasite on mice
D．a harmful parasite called Toxoplasma gondii

答案：C
解析：
根据文章第二段“She has found a way t0‘cure’mice of their inborn fear of cats by infecting them with a parasite。reported the science iournal Nature．”可知，Berkeley发现了一种通过让老鼠感染寄生虫来改变它们天生害怕猫的方法。文章下面的内容也都是围绕着这个新发现来阐述的．故选C。
第15题：

单选题
Which best characterizes how the impact of science on chimpanzees is treated in these two passages?
A
The author of Passage 1 lauds the benefits science has produced, while the author of Passage 2 speaks hopefully of possible future benefits.
B
Both of the passages react with distrust to the idea of using science to assess chimpanzees.
C
The first passage lists the studies that showed positive chimp interactions, while the author of Passage 2 refutes their claims,
D
The first passage suggests that science can have a positive impact on perceptions about chimps, whereas the second passage views science as almost universally negative.
E
The author of the first passage is more apt to justify using chimps in science than the author of Passage 2.

正确答案： E
解析：
两篇文章对于科学的态度是不同的。第一篇文章列举一些关于黑猩猩的科学发现，体现了科学的正面作用。而第二篇文章提到黑猩猩被滥用为科学实验的对象，故选D项。
第16题：

单选题
According to the passage, which of the following has changed the most in the last 500 years?
A
Food
B
Chocolate drinks
C
Potato
D
Coffee

正确答案： D
解析：
第17题：

单选题
The two passages differ in their perspectives on the debate between industrialists and environmentalists mainly in that Passage 1 emphasizes ______.
A
mathematics, while Passage 2 emphasizes psychology
B
deficiencies in the debate, while Passage 2 emphasizes progress in the debate
C
the irrelevance of externalities, while Passage 2 emphasizes their importance
D
the impact on taxpayers, while Passage 2 emphasizes the views of politicians
E
pollution, while Passage 2 emphasizes recycling

正确答案： C
解析：
第一篇文章主要是关于环境保护论争论的缺陷，提到取得的进步很少，妖魔化成分太多，并提议进行更广范围的分析。第二段表明Costanza的作品认为实业家和环境保护主义者没有明显差别，论辩因此取得了进步。
第18题：

单选题
请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration, more imprisonment, and so on.The real answer is almost certainly a combination of these factors, rather than one of them to the exclusion of the rest. But a new paper adds a surprising variable to the mix. What if the decline of crime in America started with the decline of cash?Cash is critical to the health of an underground economy, because it's anonymous, nearly untraceable, and easily stolen. This makes it the lifeblood of the black market.But Americans are rapidly abandoning cash thanks to credit cards, debit cards, and mobile payments. Half a century ago, cash was used in 80 percent of U.S. payments. Now that figure is about 50 percent, according to researchers.In the 1980s, the federal government switched from paper money to electronic benefit transfers. They didn't switch all at once. They switched one county at a time within states. This created a kind of randomly controlled environment for the researchers, who studied Missouri's counties to establish whether the areas that switched from welfare cash to electronic transfers saw a concurrent decline in crime.The results were striking: The shift away from cash was associated with a sigpificant decrease in the overall crime rate and the specific offenses of burglary and assault in Missouri and a decline in arrests. In other words, the counties saw a decline in specific crimes when they switched away from cash welfare.Perhaps most interestingly, they found that the switch to electronic transfers reduced robbery but not rape, suggesting that the move away from cash only had an impact on crime related to getting and spending cash.The move toward cashlessness in the U.S. continues quickly. Google now lets you attach money to emails to send to friends, which means that for some shoppers, pulling out your credit card could become as rare as finding exact change in your coin purse. It might seem absurd to imagine Visa, Square, and Google Wallet as crime-fighting technologies. But with a better understanding of how cash's availability affects crime, perhaps the government should consider killing more than just the penny.The government switched one county at a time within states favors researchers because ____ .
A
it reduced cash payment in Missoun
B
it offered a randomly controlled environment
C
it helped to extend electronic transfers to the state
D
it saw a concurrent decline in crimes

正确答案： D
解析：
第19题：

单选题
Which of the following is the best title for the passage?
A
Which U.S. National Park Has the Most Visitors?
B
Should National Parks Allow the Use of Cell Phones?
C
What Did Yellowstone Do to Enrich Park Visitors’ Experience?
D
Can Technology Transform the Way People Experience Nature?

正确答案： B
解析：
主旨大意题。原文第一段中就引出了文章的话题“Should park visitors be able to use cell phones，or should their use be restricted?（国家公园该不该限制游客使用手机?）”，接着针对这一问题阐述了正方和反方的观点。因此本文最佳标题应为B项。
第20题：

单选题
请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration, more imprisonment, and so on.The real answer is almost certainly a combination of these factors, rather than one of them to the exclusion of the rest. But a new paper adds a surprising variable to the mix. What if the decline of crime in America started with the decline of cash?Cash is critical to the health of an underground economy, because it's anonymous, nearly untraceable, and easily stolen. This makes it the lifeblood of the black market.But Americans are rapidly abandoning cash thanks to credit cards, debit cards, and mobile payments. Half a century ago, cash was used in 80 percent of U.S. payments. Now that figure is about 50 percent, according to researchers.In the 1980s, the federal government switched from paper money to electronic benefit transfers. They didn't switch all at once. They switched one county at a time within states. This created a kind of randomly controlled environment for the researchers, who studied Missouri's counties to establish whether the areas that switched from welfare cash to electronic transfers saw a concurrent decline in crime.The results were striking: The shift away from cash was associated with a sigpificant decrease in the overall crime rate and the specific offenses of burglary and assault in Missouri and a decline in arrests. In other words, the counties saw a decline in specific crimes when they switched away from cash welfare.Perhaps most interestingly, they found that the switch to electronic transfers reduced robbery but not rape, suggesting that the move away from cash only had an impact on crime related to getting and spending cash.The move toward cashlessness in the U.S. continues quickly. Google now lets you attach money to emails to send to friends, which means that for some shoppers, pulling out your credit card could become as rare as finding exact change in your coin purse. It might seem absurd to imagine Visa, Square, and Google Wallet as crime-fighting technologies. But with a better understanding of how cash's availability affects crime, perhaps the government should consider killing more than just the penny.Which of the following would be the most appropriate title for this text?
A
Why has Crime in America Declined since the 1990s
B
How the Decline of Cash Makes America a Safer Country
C
The Impacts of the Decline of Cash in America
D
The Relations between Cash and Crime

正确答案： A
解析：
第21题：

单选题
Which of the following is the best title for the passage?
A
American Soldiers in World War Ⅱ
B
American Civil Rights Movement
C
The Tuskegee Airmen
D
Racial Discrimination in the U.S.

正确答案： D
解析：
第22题：

单选题
This passage mainly tells us that
A
parents’ love for their children is great.
B
it is dangerous for parents to reunite with their children in a disaster.
C
we should develop reasonable plans for disasters.
D
the U.S. government has been well prepared for disasters.

正确答案： D
解析：
主旨题。[A]是文章所反映的一个方面，并非文章的主旨和重心；B在文中并没有线索表明他们的做法是危险的，而且该选项也不能反映文章的主旨，因此排除此选项；文章第二段提到说美国政府在备灾方面还存在很多不足之处，需要不断完善，因此D的说法是错误的；C“我们应该制定合理的备灾计划”正是文章所讲的中心。
第23题：

单选题
请阅读 Passage 2，完成第 26~30小题。Passage 2Americans don't like to lose wars. Of course, a lot depends on how you define just what a war is. There are shooting wars-the kind that test patriotism and courage-and those are the kind at which the U.S. excels. But other struggles test those qualities too. What else was the Great Depression or the space race or the construction of the railroads? If American indulge in a bit of flag-when the job is done, they earned it.Now there is a similar challenge-global warming. The steady deterioration of the very climate of this very planet is becoming a war of the first order, and by any measure, the U.S. is losing. Indeed, if America is fighting at all, it's fighting on the wrong side. The U.S. produces nearly a quarter of the world's greenhouse gases each year and has stubbomly made it clear that it doesn't intend to do a whole lot about it. Although 174 nations approved the admittedly flawed Kyoto accords to reduce carbon levels, the U.S. walked away from them. There are vague promises of manufacturing fuel from herbs or powering cars with hydrogen. But for a country that tightly cites patriotism as one of its core values, the U.S. is taking a pass on what might be the most patriotic struggle of all. It's hard to imagine a bigger fight than one for the survival ofa country's coasts and farms, the health ofits people and stability ofits economy.The rub is, if the vast majority of people increasingly agree that climate change is a global emergency, there's far less agreement on how to fix it. Industry offers its plans, which too often would fix little. Environmentalists offer theirs, which too often amount to native wish lists that could weaken America's growth. But let's assume that those mterested parties and others will always bent the table and will always demand that their voices be heard and that their needs be addressed. What would an aggressive, ambitious, effective plan look like-one that would leave the U.S. both environmentally safe and economically sound?Halting climate change will be far harder. One of the more conservative plans for addressing the problem calls for a reduction of 25 billion tons of carbon emissions over the next 52 years. And yet by devising a consistent strategy that mixes short-time profit with long-range objective and blends pragmatism with ambition, the U.S. can, without major damage to the economy, help halt the worst effects of climate change and ensure the survival of its way of life for future generations. Money will do some of the work, but what's needed most is will. I'm not saying the challenge isn't almost overwhelmmg, says Fred Krupp. But this is America, and America has risen to these challenges before.What does the passage mainly discuss?
A
Human wars.
B
Economic crisis.
C
America 's environmental policies.
D
Global environment in general.

正确答案： C
解析：
第24题：

单选题
Which of the following is an appropriate title for the passage?
A
California Lawmakers Vote to Raise Smoking Age to 21
B
San Francisco Increased the Age to Buy Tobacco Products to 21
C
Hawaii Has Already Raised the Age Limit to Buy Tobacco
D
A California Bill Faces Opposition from Many Republicans

正确答案： C
解析：

单选题请阅读 Passage 1,完成第21~25小题。Passage 1Why has crime in the U.S. declined so dramatically since the 1990s?Economists and sociologists have offered a bounty of reasons, including more police, more security technology, more economic growth, more immigration,

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