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
What happens during the natural growth of a tree each year?
What happens during the natural growth of a tree each year?
admin
2014-04-25
39
问题
What happens during the natural growth of a tree each year?
During this century, archaeologists have discovered that trees can be a valuable tool for measuring time. In scientific terms, this method is called dendrochronology. Dendrochronology is based on the scientific discovery that each year a tree grows a new layer of wood. When you cut down a tree, for example, you can see and count the layers of concentric circles. The layers vary in color and in thickness. These variations are a result of differing climate conditions from year to year that affects the growth of the annual rings. Cold weather, for example, creates thinner and lighter rings while hot weather produces thicker and darker rings. All trees that grow in the same region will have roughly the same pattern of annual rings, and this can be used as a source of comparison and measurement. Early in this century, archaeologists began using the rings to date ruined structures and figures built in the southwestern United States. They did this by comparing the rings of the wood found in the ruins with the rings of recently cut trees. Slowly but surely, the system was extended backwards in time to measure older ruins. The heavy forestry of the United States, coupled with the relative youth of its history, led to a fairly uncomplicated study.
选项
A、Their rings become lighter in color.
B、They have one more ring of wood.
C、They become more precious.
D、Their rings get closer and closer.
答案
B
解析
细节题。文中指出每年树木都会长粗一圈,即会多一圈年轮,故B项意思正确。
转载请注明原文地址:https://kaotiyun.com/show/ogUK777K
0
专业英语四级
相关试题推荐
Lastyear,35percentoffinalyearstudentsexpectedtoenterthegraduatejobmarket,comparedwith49percentin1998;thenu
Whatisthefocusofthepassage?
AccordingtoareportreleasedbytheMinistryofEducationrecently,Chinesestudents’abilitytohand-writeChinesecharacters
IntheUnitedStatesthefirstdaynurserywasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】______
Iftelevisionprogramsdidnotfeaturecriminals,they______resultinincreasedviolenceinsociety.
Therehasbeena______lackofcommunicationbetweentheunionandthemanagement.
IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyou______abletowritelettersinEnglish.
Withunemploymenttidethroughouttherichworld,moreandmoreyoungpeopleareseekinginternships.Manyfirms,nervousabout
What’sthepossiblerelationshipbetweenthetwospeakers?
Whatisthispassagemainlyabout?
随机试题
注册土地估价师年内情况与土地评估中介机构年检材料同时报送,由省、自治区、直辖市土地估价行业协会负责办理,年检结果向社会公布。()
企业发生下列(),会影响管理费用。
按照《企业所得税法》及有关规定,在计算应纳税所得额时,主要有( )项目不得扣除。
申请证券、期货投资咨询从业资格的机构,应当具备有200万元人民币以上的注册资本。( )
按照风险因素划分,金融风险不包括()。
不属于报刊、广播、电影等大众传播媒介特点的是()
A.肱骨外科颈骨折B.肱骨干中上l/3骨折C.肱骨干中下1/3骨折D.伸直型肱骨髁上骨折可能损伤肱动脉的骨折是
面对民族日益严重的民族危机,19世纪70年代以后,王韬、薛福成、马建忠、郑观应等早期维新派的代表人物不仅主张学习西方的科学技术,同时也要求吸纳西方的政治、经济学说。郑观应在《盛世危言》中提出的思想是
我国实行按劳分配的物质基础是
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______istos
最新回复
(
0
)