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
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’ s fli
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’ s fli
admin
2019-01-10
55
问题
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’ s flight, one of the scientists wrote in his book, "Look here for probable metal. " Scientists in another airplane, flying over a mountain area, sent a message to other scientists on the ground, "Gold possible. " Walking across hilly ground, four scientists reported, "This ground should be searched for metal. " From an airplane over a hilly wasteland a scientist sent back by radio one word: " Uranium. "
None of the scientists had X-ray eyes: they had no magic power of looking down below the earth’ s surface. They were merely putting to use one of the newest methods of locating minerals in the ground.. . trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing.
This newest method of searching for minerals is based on the fact that minerals deep in the earth may affect the kind of bushes and trees that grow in the surface.
At Watson Bar Greek, a brook(小溪)six thousand feet high in the mountains of British Columbia, Canada, a mineral search group gathered bags of tree seeds. Boxes were filled with small branches from the trees. Roots were dug and put into boxes. Each bag and box was carefully marked. In a scientific laboratory, the parts of the forest trees were burned to ashes and tested. Each small part was examined to learn whether there were minerals in it.
Study of the roots, branches, and seeds showed no silver. But there were small amounts of gold in the roots and a little less gold in the branches and seeds. The seeds growing nearest to the tree trunks had more gold than those growing on the ends of the branches.
The scientists were searching for minerals by using______.
选项
A、X-ray
B、magic power
C、a special instrument
D、trained eyes
答案
D
解析
细节题。从文章第一段的第一句“two scientists looked down with trained eyes at trees and bushes”(两位科学家用受过训练的眼睛观察树木和灌木)可知答案。故本题选择D。
转载请注明原文地址:https://kaotiyun.com/show/gOVd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
AnembarrassingexperienceItwasthesmallhoursofthemorningwhenwereachedLondonAirport.IhadcabledLondonfromAms
Lookatthepicturesbelowandwriteanessayofabout120wordsmakingreferencetothefollowingpoints:1)adescriptiono
Although"liedetectors"arewidelyusedbygovernments,policedepartmentsandbusinesses,theresultsarenotalwaysaccurate.
Although"liedetectors"arewidelyusedbygovernments,policedepartmentsandbusinesses,theresultsarenotalwaysaccurate.
Treesshouldonlybetrimmedwhenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsis
Thepredictabilityofourmortalityratesissomethingthathaslongpuzzledsocialscientists.Afterall,thereisnonaturalr
Whataretheman’shobbies?
WhatisMr.Bush’smainpurposeofthetrip?
Whichflightwillthemantake?
Whataretheman’shobbies?
随机试题
哪一项不是门脉高压症的临床表现
A.口服给药B.静脉注射C.直肠给药D.肌内注射E.透皮给药儿童在病情危重抢救时最常用的给药途径是()。
王某自1995年1月至2012年l0月一直在某安装工程公司工作,2012年10月公司提出解除劳动合同并与王某协商一致后解除劳动合同,王某离职前月工资8000元,所在城市上年度职工月平均工资2000元,该公司应向王某支付()元的经济补偿。
如果委办事项违法,代理人应()。
某初中生物老师在指导学生完成“探究种子萌发的环境条件”实验中采用合作学习的教学策略,在进行实验分组时,应遵循的原则是()。
能够为人的身心发展提供生理前提的因素是()。
中华人民共和国成立后,以毛泽东为主要代表的中央领导集体对中国社会主义建设道路作出了孜孜不倦的思考和探索,虽然经历严重曲折,但也取得了独创性理论成果和巨大成就。回顾毛泽东对中国社会主义建设道路的探索成果,对于在新的历史起点上高举中国特色社会主义伟大旗帜,坚持
设X为随机变量,E(|X|r)(r>0)存在,试证明:对任意ε>0有
下列给定程序中函数fun的功能是:把从主函数中输入的3个数,最大的数放在a中,中间的数放在b中,最小的数放在c中。例如,若输入的数为:551234,输出的结果应当是:a=55.0,b=34.0,c=12.0。请改正程序中的错误,使
NosoonerhadIclosedthedoorthansomebodystartedknocking________it.
最新回复
(
0
)