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
专升本
(84)Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’s
(84)Flying over a desert area in an airplane, two scientists looked down with trained eyes at trees and bushes. After an hour’s
admin
2019-05-23
54
问题
(84)
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 metals. " Scientists in another airplane, flying over a mountain region, sent a message to other scientists on the ground, "Gold possible. " Walking across hilly ground, four scientists reported, " This ground should be searched for metals. " 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 powers for looking down below the earth’s surface. They were merely putting to use one of the newest methods of location minerals in the ground—using trees and plants as signs that certain minerals may lie beneath the ground on which the trees and plants are growing.
(85)
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 on the surface.
At Watson Bar Creek, a brook six thousand feet high in the mountains of British Columbia, Canada, a mineral search group gathered bags of tree seeds. Boxed were filled with small branches from the trees, and roots were dug and put into boxes with each bag and box 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 trunk had more gold than those growing on the ends of the branches.
If the trees had not indicated that there was gold in the ground, the scientists would not have spent money to pay for digging deeper. They did dig and found more gold below. When They dug deeper, they found large quantities of gold.
Based on the passage, all of the following are mentioned as part of a tree that can help find minerals EXCEPT FOR______.
选项
A、leaves
B、roots
C、branches
D、seeds
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/X7JC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
A.Mygoalistofindoutwhatworksbestwhenitcomestoadulteducation.B.Inmylongseekingforlodging,Ioftenmetwith
Itryto_______atleastonehoureachdayforlearningEnglish.
Americansarepoundoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis
AmericanfootballandbaseballarebecomingknowntotheBritishpublicthroughtelevised_______fromtheUnitedStates.
OnOctober31st,dozensofchildrendressedincostumes(节日服装)knockontheirneighbors’doorsandyell"TrickorTreat"whenth
AHavenomoneybutBnotwantinganyonetoknow,heCsimplysaidhewouldgoDwithoutdinner.
Thedegree______youmaintainyourmentalhealthmaydependoncertainsimpleenvironmentalfactors.
Thebooksellercannotgetenoughbooksto______theneedsoftheircustomers.
AI’dratheryouBwouldgobytrain,becauseIcan’tCbeartheideaofDyourbeinginanairplaneinsuchbadweather.
Facialexpressionscarrymeaningsthatarepartlydeterminedbyculture.Forexample,manyJapanesedonotshowtheiremotionsa
随机试题
患者,女,62岁。患高血压1年,使用降压药时应注意
简述《外贸法》的基本原则。
关于开放性眼外伤玻切手术错误的是()
下列哪种情况下,不宜做清洁灌肠
在以医院为基础进行病例对照研究时,最容易出现的偏倚是
男,30岁。头晕,乏力2年,血压160/100mmHg,血红蛋白80g/L,尿比重1.014,尿蛋白(++),颗粒管型0~2/HP,BUN16.4mmol/L(46mg/dl),血肌酐309.4μmol/L(3.5mg/dl)。眼底视网膜动脉细窄迂曲。
下列()是每户住宅套型设计中必须设置的。
下列关于对于权益结算的涉及职工的股份支付的后续计量的说法正确的有()。
下列关于我国历史上重要会议的说法,正确的是()。
化学实验中,需要使用现有不同浓度的A、B两种氯化钠溶液配置新的浓度为15%的氯化钠溶液。已知A溶液的浓度是B溶液的5倍,且若将50克A溶液与250克B溶液混合即能完成配置,那么A溶液的浓度是()。
最新回复
(
0
)