首页
登录
职称英语
What happens to trees each year? [originaltext] During this century, archaeo
What happens to trees each year? [originaltext] During this century, archaeo
游客
2023-11-23
73
管理
问题
What happens to trees 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. These circles will reveal a great deal of information. The layers vary in color and in thickness. These variations are a result of differing climate conditions from year to year that affect the growth of the annual tings. Cold weather, for example, creates thinner and lighter tings 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. Eventually, dendrochronology produced an accurate time and weather record for the American southwest that extended over 2000 years.
选项
A、Their tings get thinner and thinner.
B、They add a ring of wood.
C、Their rings get darker in color.
D、They become more valuable.
答案
B
解析
原文中有“Dendrochronology is based on the scientific discovery that each year a tree grows a new layer of wood.”一句。
转载请注明原文地址:https://tihaiku.com/zcyy/3212486.html
相关试题推荐
[originaltext]M:OK,soifyou’rereadytotaketheplunge,ifyouwannagetou
[originaltext]M:OK,soifyou’rereadytotaketheplunge,ifyouwannagetou
[originaltext]M:IfyoulookatanylistofNewYear’sresolutionsyouwouldn’t
[originaltext]M:IfyoulookatanylistofNewYear’sresolutionsyouwouldn’t
[originaltext]M:IfyoulookatanylistofNewYear’sresolutionsyouwouldn’t
[originaltext]M:Butdon’tmanymoreparentsliveapartfromtheirmarriedchil
[originaltext]M:Butdon’tmanymoreparentsliveapartfromtheirmarriedchil
[originaltext]M:Today,we’veProfessorMcKayonourMorningTalkShow.Goodmo
[originaltext]M:Today,we’veProfessorMcKayonourMorningTalkShow.Goodmo
[originaltext]M:Today,we’veProfessorMcKayonourMorningTalkShow.Goodmo
随机试题
Itisdifficultforatwo-year-oldchild(read)______thisbook.toread不定式的固定句型:
[originaltext]M:Ouch,howcanthesandbesohotwhenthewater’sstillcold?
党在任何时候都坚持(),不允许任何党员脱离群众,凌驾于群众之上。A.权为民所用
反映微循环灌注情况的最简单而有效的指标是()A.血压 B.中心静脉压 C.意
下列不属于应付账款的审计目标的是( )。A.总体合理性 B.真实性 C.计价
研究人员让不同年龄段的儿童用词汇组成语义对应关系。比如,孩子们看到鹰、熊和知更鸟
AA BB CC DD
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
与房地产、古玩等投资相比,黄金投资的流动性和变现性()。A.更高 B.更低
某承包合同价为600万元的工程,主要材料及结构构件金额占合同总额的62.5%,预
最新回复
(
0
)