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
2024-10-31
37
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 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. [br] According to the passage, the number of wood-burning stove sold for home use _______.
选项
A、went up fivefold over a six-year period.
B、rose to seven million during the seventies.
C、multiplied thirty-five times between 1973 and the beginning of 1981.
D、increased by 6,000,000 over an eight-year period.
答案
A
解析
文中第一段说1973年有200,000燃木家用取暖炉出售了;到1979年,此数字达到一百万;到1981年末,此数字达到了七百万。因此对照后, A项正确。
转载请注明原文地址:http://tihaiku.com/zcyy/3825757.html
相关试题推荐
Americansthisyearwillswallow15,000tonsofaspirin,oneofthesafest
Americansthisyearwillswallow15,000tonsofaspirin,oneofthesafest
Americansthisyearwillswallow15,000tonsofaspirin,oneofthesafest
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
AllAmericansareatleastvaguely【C1】______withtheplightoftheAmerica
随机试题
Thepollutionquestionaswellasseveralotherissuesisgoingtobediscussed
Whenanewassemblylineisinstalled,thisfactory_____________(制造的产品将十倍于)as
以下关系哪个表述正确()。A.管理会计职业道德由财务立法部门负责制定 B.管理
下列不属于仪表管道的是()A.气动信号管道 B.测量管道 C.液压管道
隧道照明不良不属于公路隧道的带见质量问题。()
A.舒张肾脏血管 B.收缩肾脏血管 C.具有强烈利尿作用 D.仅作用于肾脏
可用来检测霍乱弧菌的霍乱毒素()A.兔肠段结扎试验B.Hep-2细胞黏附试验C
Workdonebymachineshasreplacedmanua
截至2011年底,浙江省社会组织吸纳社会各类人员就业人数约为:() A.2
根据公司法律制度的规定,负责召集和主持有限责任公司首次股东会的是()。A.出资最
最新回复
(
0
)