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.
Scientists were flying over a desert or a hilly wasteland or a mountain area in order to search for________in the ground.
选项
A、gold
B、silver
C、uranium
D、minerals
答案
D
解析
语义理解题。根据文章第一段的内容提到各种金属, 而这些金属元素是包含在矿(mineral)里的。故本题选择D。
转载请注明原文地址:https://kaotiyun.com/show/ijNd777K
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
Fishingaddsonlyaboutonepercenttotheglobaleconomy,butonaregionalbasisitcancontributeextremelytohumansurvival
Scientistsfindthathard-workingpeoplelivelongerthanaveragemenandwomen.Careerwomenare【C1】______thanhousewives.Evid
InBritain,winteristheseasonnotonlyforvisitstothetheatre,opera,concertsandballet,butalsoforshoppingorforsi
InBritain,winteristheseasonnotonlyforvisitstothetheatre,opera,concertsandballet,butalsoforshoppingorforsi
Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff
Ananimalspeciesbecomesextinctwhenitfailstoproduceenoughyoungineachgenerationtokeeppacewiththedeath-rate.We
Readthetextsfromamagazinearticleinwhichfivepersonstalkedabouttheirattitudetohelping,thepeopleindevelopingco
Youwanttohelpyourfriendtogetajobinauniversity.Writealetterofrecommendationabout120wordsincludingthefollow
Howdidthewomandointhedrivingtest?
随机试题
加入催化剂可以缩短达到平衡的时间。()
以下________不属于Internet服务。
Americansareproudoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis
下列哪种行为属于有效的民事法律行为?()
基坑工程巡视检查应包括以下主要内容()。
H.S的编排结构是将所有国际贸易商品按生产部门分为类;在各类内,基本上按同一起始原料或同一类型的产品设章,共有()章。
下列不属于物权基本原则的是()。
红筹企业可以申请发行股票或存托凭证并在科创板上市。()
对从事影响产品质量工作拥有的能力胜任所在岗位的工作,这种能力应基于适当的_________。
Duringthe1980s,unemploymentandunderemploymentinsomecountrieswasashighas90percent.Somecountriesdidnot【C1】______
最新回复
(
0
)