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
2015-08-14
109
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 lookeddown 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/sOjd777K
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
Whoisthemaninthisconversation?
Readthefollowingarticleinwhichfivepeopletalkabouttheirideasofdieting.Forquestions61to65,matchthenameofeac
Thewaypeopleholdtothebeliefthatafun-filled,pain-freelifeequalshappinessactuallyreducestheirchancesofeveratta
Thewaypeopleholdtothebeliefthatafun-filled,pain-freelifeequalshappinessactuallyreducestheirchancesofeveratta
Whatisthetopicofthisconversation?
OneafternooninJanuary1989,SusanSharp,43,andher8-year-oldson,David,werewalkinghard【C1】______anicyparkinglot,【C2
Adesertisaland【C1】______plants,animals,andpeoplecannotgetallthewatertheyneedbecausetheclimateis【C2】______tood
Whoarethetwospeakersintheconversation?
Nearlyall"speedreading"courseshavea"pacing"element—sometimingdevicewhichletsthestudentsknowhowmanywordsaminuteh
Howmanycoursesdidthewomantakelastsemester?
随机试题
女,55岁,5年前在右下前颈部触及花生米大小的肿块,无痛,近来讲话声音嘶哑,无心悸等症状。查体右甲状腺触及约2.5cm大小结节,随吞咽活动,左甲状腺未触及结节,右侧中颈部可触及肿大淋巴结,约2cm×2cm×1.5cm大小。B超示右甲状腺单发结节,内有强光点
新生儿期是
背景资料:某装机容量50万kW的水电站工程建于山区河流上,拦河大坝为2级建筑物,采用碾压式混凝土重力坝,坝高60m,坝体浇筑施工期为两年,施工导流采取全段围堰、隧洞导流的方式。施工导流相关作业内容包括:①围堰填筑;②
下列可用于支付工资及奖金的账户是()。
根据合伙企业法律制度的规定,合伙企业在清算时,企业财产在支付清算费用后,应当优先清偿()。
初中学生思维的特点属于()。
下列不属于公安事故调查的基本原则的是()。
设A,B,A+B,A-1+B-1皆为可逆矩阵,则(A-1+B-1)-1等于().
•YouwillhearpartofaninterviewbetweenheadofLeoBurnettEntertainmentandaninterviewer.•Foreachquestion23—30,mark
中国传统戏曲主要起源于原始部落的歌舞表演,是一种历史悠久的综合舞台艺术。经过几千年的发展。这类戏曲艺术才逐渐变得完整。中国戏曲有360多个种类,其中,京剧(PekingOpera)、豫剧(HenanOpera)和越剧(ShaoxingOpera)最为
最新回复
(
0
)