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 flig
Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’s flig
admin
2022-08-05
30
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丛)可知答案。故本题选择D。
转载请注明原文地址:https://kaotiyun.com/show/qjNd777K
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
AftertheviolentearthquakethatshookLosAngelesin1994,earthquakescientistshadgoodnewstoreport:Thedamageanddeath
Thehumannosehasgiventothelanguageoftheworldmanyinterestingexpressions.Ofcourse,thisisnotsurprising.Withoutt
Readthetextsfromamagazinearticleinwhichfivepersonstalkedabouttheirattitudetohelpingthepeopleindevelopingcou
InBritain,winteristheseasonnotonlyforvisitstothetheatre,opera,concertsandballet,butalsoforshoppingorforsi
WhatisMr.Bush’smainpurposeofthetrip?
Readthetextsfromamagazinearticleinwhichfivepersonstalkedabouttheirattitudetohelpingthepeopleindevelopingcou
Drunkendriving—sometimescalledAmerica’ssociallyacceptedformofmurder—hasbecomeanationalepidemic.Everyhourofevery
Waterproblemsinthefuturewillbecomemoreintenseandmorecomplex.Ourincreasingpopulationwilltremendouslyincreaseurb
Americanarchitectureisatitsbestwhenitisconcernedwithbuildingsthathaveapracticalpurpose.Factories,officebuildi
随机试题
社会工作者通过个别访谈,倾听居民在接受服务或参与活动中的个人感受及体会,了解居民对社区社会工作服务方案的意见和建议以及方案实施过程中应注意的问题。这一工作过程属于()。
有关放大摄影的叙述,错误的是
胃脘胀痛,嗳腐吞酸,多见于胃脘胀痛、吞酸嘈杂,胸胁闷胀,多见于
脾气虚证与脾阳虚证鉴别要点是
赵女士,停经50天,阴道出血2天,量如月经,下腹部坠痛。检查:子宫增大如孕40天大小,宫颈口已扩张,见有胚囊堵塞于子宫颈内口。首先考虑为()
有助于肝癌早期诊断的实验室检查是
根据国务院有关规定,购房时享受税收优惠政策的普通住房应满足的条件之一为单位单套建筑面积在()平方米以下。[2007年考试真题]
建立账套。(1)账套信息账套号:106账套名称:吉顺科技有限公司启用会计期:2014年1月(2)单位信息单位名称:吉顺科技有限公司单位简称:吉顺科技(3)核算类型行业性质:小企业会计制度账套主管:王艳(4)
下列说法中,正确的是().
下列关于BGP协议的描述中,错误的是()。
最新回复
(
0
)