首页
登录
职称英语
Throughout much of the Tertiary period(most of the past 65 million years), t
Throughout much of the Tertiary period(most of the past 65 million years), t
游客
2025-02-19
39
管理
问题
Throughout much of the Tertiary period(most of the past 65 million years), the Arctic supported continuous forests. Only toward the end of that period does the fossil evidence show that certain present-day Arctic plants were established and widely
distributed
throughout the Arctic. Many Arctic plants are thought to have originated in the high mountain ranges of central Asia and North America, to have spread northward to the Arctic as global temperatures fell in the late Tertiary, and to have achieved a circumpolar distribution by the end of the Tertiary(about 2 million years ago). However, fossil evidence to support these proposals is either lacking or fragmentary. Consequently, the routes by which these plants expanded their ranges during their colonization of the Arctic remain unknown. [br] Which of the following statements about Arctic plants is supported by the passage?
选项
A、The decline in global temperature in the late Tertiary prevented many high-mountain plants from becoming established in the Arctic.
B、There is not enough evidence to firmly establish the historical migration routes of present-day Arctic plants.
C、Present-day Arctic plants are less likely to leave fossil remains than are plants outside the Arctic
答案
B
解析
对应最后两句,not enough对应lacking、fragmentary和remain unknown。A项根据第三句,温度下降使得植物向北极迁移并形成分布,和选项A中的“阻止”相反。C项没有对比北极和北极之外的化石遗迹。
转载请注明原文地址:https://tihaiku.com/zcyy/3964049.html
相关试题推荐
ThroughoutmuchoftheTertiaryperiod(mostofthepast65millionyears),t
ThroughoutmuchoftheTertiaryperiod(mostofthepast65millionyears),t
ThegreatmajorityofextantdecoratedartifactsfromtheMiddlePeriodoft
Throughoutthehistory,maleleadersoftenmadesocietymoreviolentandcon
ThechartbelowcontainsinformationprovidedbyAustralia’stertiaryinstit
ThePrize:$10MillionATheyareaneliteclubof
ThePrize:$10MillionATheyareaneliteclubof
ThePrize:$10MillionATheyareaneliteclubof
ThePrize:$10MillionATheyareaneliteclubof
ThePrize:$10MillionATheyareaneliteclubof
随机试题
Whatisthemainideaofthispassage?[br][originaltext]Alibertarianthinkt
[originaltext]W:Youhaveaverygoodstereosystem...Whatafinesounditpr
下列病症会引起喷射性呕吐的为( )。A.流行性乙型脑炎 B.猩红热 C.胃
歌曲《沂蒙山小调》属于一部曲式两句结构乐段中的()结构。A.对比式 B.平行
在安全生产责任制度中,()在各自的岗立二承担严格遵守劳动安全技术规程的义务。A:
蔊菜既能清热解毒、利湿退黄,又能A.清肺化痰 B.温肺化痰 C.祛痰止咳
1.2008年夏天,上海一篇满分的高考作文《他们》引起了广泛的热议,专家称这是上
从器件角度看,计算机经历了四代变化。但从系统结构看,至今绝大多数计算机仍属于(
大叶性肺炎时肺肉质变的发生主要是由于A、病变范围广 B、肺组织破坏严重 C、
关于建设工程索赔成立条件的说法,正确的是( )。A.导致索赔的事件必须是对方的
最新回复
(
0
)