首页
登录
职称英语
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soil
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soil
游客
2024-02-06
20
管理
问题
As the earth’ s surfaces warm, evaporation(蒸发)is drying out forests and soils, increasing susceptibility to fire. Last summer, more than 7.3 million acres of U.S. forests burned during an intense drought. Most alarmingly, as an intergovernmental panel concluded in 2001, earth’ s biological systems are already responding to climate change. The current epidemic(传染病)of bark beetles adds a new dimension to the risk of fires.
Mountain bark beetles attack lodgepole, ponderosa(黄松), Douglass fir(枞木), sugar and western white pines, destroying them by injecting a fungus(真菌). The galleries of eggs they lay inside the bark pave the way for the trees’ death within a year. Healthy trees secrete pitch to drown the invaders and plug the holes they bore, but drought dries out the pitch. Woodpeckers and nuthatches keep adult numbers in check, but with warmer winters, beetle populations can quadruple in a year, outpacing their pursuers.
Warming is increasing the reproduction, abundance and geographic range of beetles, destabilizing the age-old, hard won truce between insects and vegetation. Since 1994, mild winters in Wyoming have helped the beetle larvae(幼虫)survive the season. Usually, 80 percent die, but the mortality rate has dropped to less than 10 percent. In Alaska, spruce bark beetles are sneaking in an extra generation a year due to warming, and have destroyed 4 million acres in the Kenai Peninsula in the past five years. "This is another example of global climate change that has deadly implications for my state," declared Alaska’s Republican Sen. Ted Stevens last year.
Warming is also expanding the beetles’ range into higher altitudes. In the past four or five years, they have begun to attack whitebark pines at an elevation of 8,000 feet or higher. Jesse Logan, who works for the Utah Forest Service, told the Billings(Mont.)Gazette last month that this development coincides with an overall wanning trend that began in the 1980s. "Beetles are cold-blooded, so their metabolism is related to the environment they’re in," according to Logan, who said the beetles seem to be a reliable indicator of global climate change. [br] Which of the following statement is true?
选项
A、The life expectancy of the bark beetles is becoming shorter.
B、Global warming doesn’ t influence the earth’ s biological systems.
C、The number of woodpeckers is rapidly increasing because of warmer winters.
D、We can rely on bark beetles to indicate global climate change.
答案
D
解析
细节题。根据本文的大意(见第1题解析),A、B和文章的意思相悖。C中因为暖冬数量增加的是这种甲虫,而不是啄木鸟,故错误。D这一细节在文中结尾,“the beetles seem to be a reliable indicator of global climate change”提及过,故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3425928.html
相关试题推荐
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
[originaltext]Mostrainforestslieclosetotheequator,wheretheclimate
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
Astheearth’ssurfaceswarm,evaporation(蒸发)isdryingoutforestsandsoil
随机试题
In1565______establishedthefirstpermanentEuropeansettlementinthecontinen
Whatisthewoman’sattitudetohernewjob?[br][originaltext]M:Whatanice
Interpersonalcommunicationisyourinteractionwithothers.Talkingtoafr
关于追加投资额的说法中不正确的是()。A、持仓头寸获利后立即平仓,不再追加投资B、持仓头寸获利后追加的投资额应等于上次的投资额C、持仓头寸获利后追
渗出性胸腔积液的病因可包括()。A.心力衰竭 B.低蛋白血症 C.肺部感染
A.女孩,2岁,反复肺炎,于胸骨左缘第3肋间闻及Ⅲ级收缩期杂音 B.女孩,16
证券公司设立私募基金子公司应当符合下列哪些要求()。 ①最近6个月各项风
2020年11月,经统计可知,北京轨道交通路网运营线路达23条,总里程699.3
A.肾小球性蛋白尿 B.溢出性蛋白尿 C.组织性蛋白尿 D.体位性蛋白尿
下列关于预算定额的计算公式,错误的是()。A.分项工程预算定额基价=人工费
最新回复
(
0
)