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
82
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
Belowareaseriesofpicturesshowingtheproblemoccurringiiiourdailyconversation.Lookatthepicturesandwriteanessa
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
Readthetextsfromamagazinearticleinwhichfivepersonstalkedabouttheirattitudetohelpingthepeopleindevelopingcou
WhatisMr.Bush’smainpurposeofthetrip?
WhatisMr.Bush’smainpurposeofthetrip?
Whoisthemanspeakingto?
Theostrich,thelargestbirdintheworldatpresent,livesinthedrierregionsofAfricaoutsidetheactualdeserts.Becauseo
InBritain,peoplehavedifferentattitudestothepolice.Mostpeoplegenerally【C1】______themandthejobtheydo—althoughther
Playistheprincipalbusinessofchildhood,andmoreandmoreinrecentyearsresearchhasshownthegreatimportanceofplayi
随机试题
简述非言语沟通的类型。
标线的颜色包括白色、黄色、橙色、红色和绿色()。
在划分路线价区段时,应将()的土地划分为同一个路线价区段。
按国际标准(ISO6308—1980)石膏墙板推荐宽度为600mm,900mm,1200mm,下列石膏墙板的推荐长度哪组是正确的?[2003年第004题]
“备案号”栏应填:“运费”栏应填:
与增量预算法相比,零基预算法的主要缺点有()。
建设“智慧山东”是以()为核心资源。
政府对进出口贸易进行干预的手段包括关税壁垒、非关税壁垒、出口退税、出口补贴。()
A、 B、 C、 D、 C
运动员:兴奋剂
最新回复
(
0
)