首页
登录
职称英语
As the cost of gas and oil for home heating has gone up, many Americans hav
As the cost of gas and oil for home heating has gone up, many Americans hav
游客
2024-10-15
42
管理
问题
As the cost of gas and oil for home heating has gone up, many Americans have switched from these fuels to wood for heating their homes. In 1973, approximately 200,000 wood-burning stoves, intended for home use, were sold in the United States; by 1979, this figure had reached one million; and by the end of 1981, there were as many as seven million home owned wood-burning units in operation in the U. S.
In addition to low fuel bills, many people choose these stoves because their initial cost is very low (the prices range from $ 50 kits to $ 5,000 top-of-the-line models), and because new technology has made wood fires more efficient, cleaner, and, therefore, safer than ever before.
One new technological feature of this type is the catalytic(催化) combustor which adds about $ 100 to $ 200 to the cost of the stove, but which causes much more complete combustion (燃烧) of the wood and therefore bums up more of the pollutants left by incomplete combustion and produces more heat.
A second cost-saving innovation is a device which agitates the wood, increasing the amount of oxygen that reaches the center of the wood pile, and leading to more efficient combustion. The real advantage of this device is that it allows the owner to make use of cheap sources of wood such as dirty wood chips (an industrial by-product) that have almost no commercial value, cost as little as $ 20 a ton, and burn very inefficiently in furnaces without an agitator. [br] The passage states that ______.
选项
A、many Americans have switched from hydrocarbon-based fuels to wood because the price of the latter has risen
B、some wood-burning stoves cost up to one hundred times more than others
C、catalytic combustors increase the amount of pollution caused by wood burning stoves
D、agitators are cheaper addition to wood-burning stoves than catalytic combustors
答案
B
解析
A项表示与事实正好相反,C项应是decrease,而不是increase;D项文中并未说明agitators的价格,所以无法比较。而文中第二段括号内的文字(the prices range from $ 50 kits to $5,000 top-of-the-line models)表明炉子价格之差相差100倍,所以B项是正确的。
转载请注明原文地址:https://tihaiku.com/zcyy/3802676.html
相关试题推荐
Toaccompanythesongs,NativeAmericansused_______.[br][originaltext]
Toaccompanythesongs,NativeAmericansused_______.[originaltext]Native
Theirresponsibleteacherknewthestudentwascheatingbutdecidedtolook____
Asthecostofgasandoilforhomeheatinghasgoneup,manyAmericanshav
Americansparticipatedinagreatdebatethroughoutthe1960sand1970s.Th
Americansparticipatedinagreatdebatethroughoutthe1960sand1970s.Th
Americansparticipatedinagreatdebatethroughoutthe1960sand1970s.Th
Americansareeating______vegetablesperpersontodayastheydidin1910.A、mo
Thepressure______causesAmericanstobeenergetic,butitalsoputsthemunder
Americansoftensaythattherearetwothingsaperson______inlife:deathandt
随机试题
【B1】[br]【B3】A、jokinglyB、angrilyC、anxiouslyD、curiouslyBjokingly意为“开玩笑地”,ang
[originaltext]WhywasFrancissenttoGermanylastweek?(A)Tencentspercall.
Peoplejudgethesedeviationsfromthenormaspositivebecausetheysuggesttha
学习结果分类理论的提出者是( )。A.奥苏贝尔 B.布卢姆 C.皮亚杰
某工程项目主体工程和装饰工程均可分为四个施工段组织流水作业,其流水节拍分别为4、
主张以个人的本性和个体发展的需要来确定教育目的,就形成了( )。A、神学的教育
C
下列各项中,()是资产重组行为A:与其它公司股权置换B:公司增发新股C:会计
急性哮喘发作首选A.沙丁胺醇吸入 B.氨茶碱口服 C.倍氯米松口服 D.麻
对工程项目的可行性进行科学论证,是工程项目投资建设周期中()阶段的主要任务
最新回复
(
0
)