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
考研
The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and i
The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and i
admin
2014-09-13
21
问题
The economy in the United States is heavily dependent on aluminum, a material widely used in the construction of buildings and in making such diverse things as cars, airplanes, and food containers. In 1979 Americans used over five million tons of new aluminum, and one and a half million tons of recycled aluminum. Some ninety percent of the bauxite(矾土)ore from which new aluminum is normally derived had to be imported to meet the demand. Poorer ores are abundant in the United States, however, researchers at Purdue University may recently have found a way to obtain aluminum magnetically from these.
Although aluminum is not attracted by ordinary magnets, under special conditions it becomes temporarily "paramagnetic" , or very weakly responsive to a magnetic field. This is achieved by immersing ore particles in water to which certain salts have been added and then filtering the ore through steel wool in the presence of a strong magnetic field. It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import.
The passage focuses on______.
选项
A、construction and manufacturing industry in the United States
B、new technique of obtaining aluminum from poor ores
C、consumption and production of aluminum in the United States
D、the annual import of high-grade aluminum into the United States
答案
C
解析
本题考查的是对短文主旨大意的理解。首段说的是美国对铝的需求及其来源,第2段讲述了一种新的提取铝的方法。故C.consumption and production of aluminum in theUnited States最符合题意,A、B、D虽然提到与短文有关的内容,但都不够全面。
转载请注明原文地址:https://kaotiyun.com/show/fVii777K
本试题收录于:
GCT工程硕士(英语)题库专业硕士分类
0
GCT工程硕士(英语)
专业硕士
相关试题推荐
Whichofthefollowingisthemainpurposeofthisannouncement?Specificschedulerevisionsforwhichofthefollowingfacilit
Therealestatecorporationislookingfor______.Thepersonwhoisinterestedinthepositionshould______.
Accordingtothepassage,somepeoplestartedanationalassociationsoasto______.Fromthetoneofthepassageweknowthat
WhatisthetypicalscenefoundinthecampusofWesleyanUniversity?Whatisthepolicyadoptedbymanyschoolsafterheatedd
WhatisthetypicalscenefoundinthecampusofWesleyanUniversity?Fromthepassagewecanseethat______.
Patient:Istrainedmybacktheotherdayworkinginthegarden.Doctor:______
Colorisveryimportanttomostanimalsforithelpsthemtogetalongintheworld.Color【B1】tomakeananimaldifficultforit
A:DoctorSmithisengagedonWednesday.WouldyouliketocomeonThursday?B:______.
TheflatofferedinadD______.
Whilestillinitsearlystages,welfarereformhasalreadybeenjudgedagreatsuccessinmanystates,atleastingettingpeop
随机试题
伤(病)残调整生命年(DALY)
X线管套内绝缘油的作用是
患者,男,55岁,前日中午参加婚宴后下午开始腹痛,为持续性胀痛,牵涉后背,伴恶心、呕吐。有胆囊结石病10年。查体:体温37.2℃,血压110/82mmHg,脉率108次/分,呼吸24次/分,Hbl08g/L,巩膜可疑黄染,上腹膨隆,全腹压痛,以左上腹为重,
A.限制性内切酶B.反转录酶C.DNA连接酶D.碱性磷酸酶E.DNA聚合酶工
背景资料:某溢洪道除险加固工程,控制段共5孔,每孔净宽9.0m,底板顶面高程为21.0m,闸墩顶高程32.0m,墩顶以上为混凝土排架、启闭机房及公路桥。加固方案为:底板顸面增浇20cm厚混凝土,闸墩外包15cm厚混凝土,拆除重建排架、启闭机房、公
跟单员跟踪采购单的最后环节是()
Anvlossordamagenoticedwhenthegoodsaredeliveredmustbereportedtothe()atthetime,otherwisehewillnotbeliable
Forpeoplesufferingfromdepression,theadviceisusuallythesame:seekhelp.Thissimple-soundingdirective,moreover,is【M1
A、Onhousing.B、Oneconomy.C、Onmarketing.D、Onchoiceofresources.A选项和主题有关。从ThisistheproblemwhichistrueinU.K.marke
A、Aninventionmadebyarchitectsandengineers.B、Anewdevicegatheringinformationaboutbuildings.C、Anintroductionofath
最新回复
(
0
)