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
71
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
SpeakerA:Goodmorning,sir.CanIhelpyou?SpeakerB:Yes,I’mleavingtoday
假设系统采用PV操作实现进程同步与互斥。若n个进程共享两台打印机,那么信号量S的
()是项目成本管理的第一责任人。A.总监 B.项目经理 C.财务主管 D
①黄老师的教学语言诙谐幽默,妙趣横生,常常逗得大家_。 ②安全检查工作非常重要
产后"三急"是指A.呕吐、泄泻、盗汗 B.高热、昏迷、自汗 C.心悸、气短、
治疗脾约便秘,首选的方剂是A.温脾汤 B.济川煎 C.黄龙汤 D.麻子仁丸
由于房地产经纪人员与服务对象之间存在着较为明显的信息( )现象,因此对房地产经
黄芪配茯苓属于药物七情中的( )。A.相须 B.相使 C.相反 D.相畏
患者,男,72岁既往有高血压、心绞痛、心力衰竭、房室传导阻滞和胃溃疡病史。一个月
注册会计师运用审计抽样实施细节测试时,下列各项中,可以作为抽样单元的有()
最新回复
(
0
)