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
50
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
KarlMarx’ssocialhistoricalresearchdeeplyrevealsthe________relationsbetwe
ThePresidenthimselfisconstantlyleavingWashingtonwhileheissummonedto"
Americanwomenwilloccasionallywearshortskirts,sleevelessshirts,makeu
Mr.Smithbecamevery______whenitwassuggestedthathehadmadeamistake.A、in
误码率与传输有很大的关系。()
计量经济学模型用于政策评价的方法主要有()。A.工具-目标法、政策模拟、最优控
关于股权投资基金所提供的增值服务,下列表述不正确的是( )。A.增值服务可以降
护士判断先天性心脏病右向左分流型最明显的外观特征是A.心脏杂音 B.乏力、气促
临床对药品疗效评价和质量信息反馈、灭菌制剂留样观察记录、质量事故分析报告资料保存
中华古诗词中有很多富含哲理的诗句,比如,“沉舟侧畔千帆过,病树前头万木春”反映了
最新回复
(
0
)