首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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
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
admin
2012-10-20
62
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.
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://kaotiyun.com/show/ULhK777K
0
专业英语四级
相关试题推荐
Feelingthatshewasintheright,theoldladytook______atthedirtyremark.
Noonecanbe______calmwhenfacingwithagreatdanger.
Americansbelievetimeisalimitedresource;theytrytoconserveandmanageit.PeopleintheU.S.often【C1】______seminarsor
ItispossibleforstudentstoobtainadvanceddegreeinEnglishwhileknowinglittleornothingabouttraditionalscholarlymet
TheWorldHealthOrganizationreportedtheenvironmentalhealthrisks,NOTincluding
Iflifeexpectancywereamarathon,youcouldsaythattheUnitedStatesisfadingfromthepack.Althougheveryoneislivinglo
MyteachertoldmeseriouslythatIshouldkeep______ofthatfellowwhoalwayscausedtroubles.
Atthefall2001SocialScienceHistoryAssociationconventioninChicago,theCrimeandJusticenetworksponsoredaforumonth
Hepolitelyrefrainedhimself______sayingwhathethoughtofherhat.
ScientistshadthoughtpeoplebeganmanipulatingfiretocreatetoolsinEuropeabout25,000yearsago.Butthenewfindssugge
随机试题
A.49天以前B.10周内C.10~14周D.14~24周E.14~28周
患者,男,57岁。消瘦,明显皮肤色素沉着,反复发作四肢无力,疑艾迪生病。血ACTH200pg/ml,血皮质醇60μg/dL。最可能的诊断是
承销商可以提供承销团以外的机构撰写的投资价值研究报告。()
对资产评估机构从事证券业务实行监督管理的部门为财政部和中国证监会。()
某生产企业准备投资,有A、B、C三个方案,项目周期为5年。根据已知条件估算,三个方案的初始投资额分别为100万、80万、50万。A方案的年折旧额为20万元,年净利为19万元;B方案的年折旧额为10万元,年净利为10万元;C方案的年折旧额为15万元,年净利为
根据《中华人民共和国宪法》的规定,中华人民共和国中央军事委员会领导全国武装力量。下列关于中央军事委员会的说法错误的是()。
某商店10月1日开业后,每天的营业额均以100元的速度上涨,已知该月15号这一天的营业额为5000元,问该商店10月份的总营业额为多少元?()
—Readthearticleaboutcorporationmerger.—Choosethebestsentencetofilleachoftheblanks.—Foreachblank8-12markone
WhichofthefollowingisCORRECT?
ThenumbersincolumnDarelinkedinsomewaytothoseinA,BandC.Whatnumbershouldreplacethequestionmark?
最新回复
(
0
)