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
专升本
Successful innovations have driven many older technologies to extinction and have resulted in higher productivity, greater consu
Successful innovations have driven many older technologies to extinction and have resulted in higher productivity, greater consu
admin
2007-12-01
103
问题
Successful innovations have driven many older technologies to extinction and have resulted in higher productivity, greater consumption of energy, increased demand for raw materials, accelerated flow of materials through the economy and increased quantities of metals and other substances in use each person. The history of industrial development abounds with examples.
In 1870, horses and mules were the prime source of power on U. S. farms. One horse or mule was required to support four human beings—a ratio that remained almost constant for many decades. At that time, had a national commission been asked to forecast the horse and the population for 1970, its answer probably would have depended on whether its consultants were of an economic or technological turn of mind. Had they been "economists" , they would probably have projected the 1970 horse or mule population to be more than 50 million. Had they been "technologists", they would have recognized that the power of steam had already been harnessed to industry and to land and ocean transport. They would have recognized further that it would be the prime source of power on the farm. It would have been difficult for them to avoid the conclusion that the horse and mule population would decline rapidly.
According to the passage, what supplied most of the power on U. S. farms in 170?
选项
A、Animals.
B、Humans.
C、Engines.
D、Water.
答案
A
解析
细节题。第二段的第一句话讲了horse和mules是主要的劳动力,也就是说动物是主要的劳动力。
转载请注明原文地址:https://kaotiyun.com/show/MsLC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
∫xf(x)dx=arcsinx+C,求。
设函数y=y(x)由方程ex-ey=xy确定,求。
设函数f(x)=x(x-1)(x-2)(x-3),则方程f’(x)=0的实根个数为()。
Becauseillegalbehaviorgenerallyharmsotherindividualsorsocietiesatlarge.Ourcourtsystemmustpunishpeoplewhodon’t
You’dbettertellmebeforehandif______gowithme.
Ilikeclimbingmountains______mybrotherpreferswatersports.
不言而喻,科学技术的发展对中国现代化是至关重要的。
Themanagementoflogistical(物流的)operationisaboutmovementandstorageofmaterialsandfinishedproducts.Logisticaloperat
Earthquakesareanunusual______(occur)inEnglandbutarenottotallyunknown.
Mymotherneverletherselfgetdown.Nomatterhowbadthingswere,shestayedcheerful.Eventhoughwehadahardlife,shest
随机试题
设随机变量ξ在区间[1,6]上服从均匀分布,求方程x2+ξx+1=0有实根的概率。
行列式=().
下列有关粉尘爆炸的特性及影响因素中正确的有()。
关于施工现场消防管理的说法.正确的有()。
下列合同,具有法律效力的是()。
鸦片战争后,中国传统自然经济逐步瓦解,正确解释是()。
许多民众认为奶粉的营养比不上鲜奶,乳企不该在乳制品中使用奶粉。同时,一些乳业专家也认为,由液态奶制成乳粉的过程需要经过两到三次提温脱水,而由乳粉再制成复原乳的时候,还要再重新加水、加温和消毒,数次提温必定会造成营养成分的流失。而美国农业部的一份关于复原乳和
统筹区域发展,促进地区协调发展,缩小区域间的发展差距,是我国经济社会发展的一个重要原则。在当前和今后一个时期,我国促进区域协调发展必须重点实施的战略是()
若一个问题的求解既可以用递归算法,也可以用递推算法,则往往用(14)算法,因为(15)。
Twopeoplehadmetthegeneralbefore,but______recognizedhim.
最新回复
(
0
)