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
2016-03-05
52
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/vzPK777K
0
专业英语四级
相关试题推荐
WhatcharacteristicdoAmericanslikeabouttheShakerfurniture?
______toschoollifewaslessdifficultthanthepupilhadexpected.(2013-66)
Therewere150_____attheinternationalconferencethissummer.(2010-68)
I’llseetoitthatthechildren______ahotmealaftertheirswim.
Ishouldliketogetridoftheresponsibilityforthisjob,buttheredoesn’tseemtobeanyonefitto______to.
______you______furtherproblemswithyourprinter,contactyourdealerforadvice.[2005]
Itisimperativethatyou______youresignationbeforeFriday.
WhatwassaltusedtodoinEgyptthousandsofyearsago?
Tensofthousandsof18-year-oldswillgraduatethisyearandbehandedmeaninglessdiplomas.Thesediplomaswon’tlookanydiff
随机试题
近代中国半殖民地半封建的社会性质,决定了()
所有断裂包括脆性断裂,在断裂前都是有预兆的。
欲使某单底物酶促反应达到Vmax的75%,其底物浓度应达到酶km的()倍。
妇科杂病是指
二级市场又称为(),是供投资者买卖已发行证券的场所。
高速公路、一级公路的水泥混凝土路面的接缝材料宜采用()。
下列关于胸膜腔描述正确的是()。
西方教育心理学的名称和体系确立的标志是()的出版。
Theglobalincreaseingreenhousegaseshasbeenattributedto
A、Itknocksatyourdooronlyonceinawhile.B、Itissomethingthatnoonecanpossiblycreate.C、Itcomesnaturallyoutofon
最新回复
(
0
)