首页
登录
职称英语
What happens to trees each year? [br] [originaltext] During this century, a
What happens to trees each year? [br] [originaltext] During this century, a
游客
2024-10-15
48
管理
问题
What happens to trees each year? [br]
During this century, archaeologists have discovered that the 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 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. Eventually, dendrochronology produced an accurate time and weather record for the American southwest that extended over 2,000 years.
选项
A、The climate.
B、The exposure to light.
C、The length of time.
D、The fertility of the soil.
答案
A
解析
原文中有“These variations are a result of differing climate conditions from year to year that affect the growth of the annual rings.”一句。
转载请注明原文地址:http://tihaiku.com/zcyy/3801769.html
相关试题推荐
WhichstatementaboutMadonnaisNOTtrue?[br][originaltext]Madonna,the
WhichstatementaboutMadonnaisNOTtrue?[originaltext]Madonna,theU.S.
Whathappenstotreeseachyear?[br][originaltext]Duringthiscentury,a
Whathappenstotreeseachyear?[br][originaltext]Duringthiscentury,a
Whathappenstotreeseachyear?[originaltext]Duringthiscentury,archaeo
Whatisthewoman’sfavoritehobby?[br][originaltext]M:Hello!Youseemworri
Whatisthewoman’sfavoritehobby?[br][originaltext]M:Hello!Youseemworri
Whatisthewoman’sfavoritehobby?[originaltext]M:Hello!Youseemworried.Ca
WhereisMrs.Bushvisitingnow?[br][originaltext]UnitedStatesFirstLad
Whowastherecentsurveycarriedoutby?[originaltext]Dochildrenreally
随机试题
Questions16-22•Lookatthenotesonhowtosucceedinajobinterview.•Some
Hehadbeen______toappearincourtonchargesofincitementoflawbreaking.A、il
Peoplearemorelikelytomakeapurchase______.[br][originaltext]W:Ijust
Ibelievewhathehaswrittenis______whatyouhaveimagined.A、sogoodorbett
[originaltext]Membersoftheworkingclasshaveblue-collarjobs.Theyare
计算机操作中,导致IT系统服务中断的各类数据库故障属于( )。A.人为操作故障
基金管理人合规管理的具体内容不包括( )。A.审核各业务部门对外签订的合同,控
某高层住宅,采用筏板基础,基底尺寸为21m×30m,地基基础设计等级为乙级。地基
对于工期一年以上,工程内容和技术经济指标规定的非常明确的建安工程项目,宜采用()
某风力发电场,一期装设单机容量1800kW的风力发电机组27台,每台经箱式变升压
最新回复
(
0
)