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
2009-02-10
39
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 burns 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://jikaoti.com/ti/M65MFFFM
0
专业英语四级
相关试题推荐
WastheRedPlanetonceawetplanet?ApluckyMartianroverfinallydeliverssomehardevidence.GiovanniSchiaparellicould
TheMessagesinDistanceI.Peoplefromdifferentcultures【T1】______differently【T1】______A.NorthAmericansstandabouttwof
TheMessagesinDistanceI.Peoplefromdifferentcultures【T1】______differently【T1】______A.NorthAmericansstandabouttwof
A、Smoking.B、Drinking.C、Depression.D、Medication.A此题也需要用排除法解答。关于长久认知问题产生的主要原因,受访者提到:Persistentcognitiveproblemsina40-some
A、Tenniscourt.B、Massageservice.C、Sauna.D、Privatecoach.C推断题。John提到法国的这个宾馆带健身房:Ohyes,theyhaveagymnasiumthattheguests
Unlikeanyothercreatureonthisplanet,humanscanlearnandunderstand,withouthavingexperienced.Theycanthinkthemselve
Excessivecaloriesfromsugarcancontributetoweightproblems,andsugarisalsowellknownforitsabilitytopromoteteethd
(1)ScientistssayChandraprovidesfirstevidencethattwomysteriescancoexistinonegalaxy.(2)Inaverybrightgalaxy4
(1)Themoreresponsibilityyoutakeonatworkandinlife,themoreoftenyoufacegray-areaproblems.Thesearesituations
随机试题
患儿,10天,今洗澡时发现双小腿皮肤冷硬而就诊。系第1胎,孕36周顺产,出生体重2.4kg,生后第2天皮肤稍黄,近2天黄疸有所加深,家长诉无发热,吸奶好。查体:体温35.5℃,呼吸40次/分,脉搏120次/分,全身皮肤中度黄染,无发绀,双肺呼吸音清,无啰音
女,36岁。反复腹泻2年,间有脓血便,粪培养阴性,多种抗生素治疗无效,为明确诊断,首选的检查是
英国宪法是历史长期发展的产物,具有很强的延续性,其渊源不包括:()
下列选项中为镇区总体规划任务的是()。
年末结账后,本年利润账户一定没有余额。()
现在的招录考试几乎都变成了考试主办方和考生__________的博弈游戏。考试主办方__________用一个个小陷阱__________考生做错,考生则尽可能地搜集陷阱模式,境界高的是眼睛一扫题目就知道命题人设置的陷阱。依次填入横线处的词语,最恰当的一组
属于房地产投资优点的有()。
若=∞,则下列表达式正确的是()。
某项工作,甲、乙合作需4小时完成,乙、丙合作需5小时完成。现在先请甲、丙合作2小时后,余下的乙还需做6小时完成。乙单独完成这项工作需要
【B1】【B7】
最新回复
(
0
)