首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
At the base of a mountain in Tanzania’s Gregory Rift, Lake Natron burns bright red, surrounded by the remains of animals that we
At the base of a mountain in Tanzania’s Gregory Rift, Lake Natron burns bright red, surrounded by the remains of animals that we
admin
2021-01-08
98
问题
At the base of a mountain in Tanzania’s Gregory Rift, Lake Natron burns bright red, surrounded by the remains of animals that were unfortunate enough to fall into the salty water. Bats, swallows and more are chemically preserved in the pose in which they perished, sealed in the deposits of sodium carbonate in the water. The lake’s landscape is bizarre and deadly—and made even more so by the fact that it’s the place where nearly 75 percent of the world’s flamingos(火烈鸟)are born.
The water is so corrosive that it can burn the skin and eyes of unadapted animals. Flamingos, however, are the only species that actually makes life in the midst of all that death. Once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed. Three-quarters of the world’s flamingos fly over from other salt lakes in the Rift Valley and nest on salt-crystal islands that appear when the water is at a specific level—too high and the birds can’t build their nests, too low and predators can move briskly across the lake bed and attack. When the water hits the right level, the baby birds are kept safe from predators by a corrosive ditch.
"Flamingos have evolved very leathery skin on their legs so they can tolerate the salt water," says David Harper, a professor at the University of Leicester. "Humans cannot, and would die if their legs were exposed for any length of time. " So far this year, water levels have been too high for the flamingos to nest.
Some fish, too, have had limited success vacationing at the lake as less salty lagoons(泻湖)form on the outer edges from hot springs flowing into Lake Natron. Three species of tilapia(罗非鱼)thrive there part-time. " Fish have a refuge in the streams and can expand into the lagoons when the lake is low and the lagoons are separate," Harper said. "All the lagoons join when the lake is high and fish must retreat to their stream refuges or die. " Otherwise, no fish are able to survive in the naturally toxic lake.
This unique ecosystem may soon be under pressure. The Tanzanian government has once again started mining the lake for soda ash, used for making chemicals, glass and detergents. Although the planned operation will be located more than 40 miles away,drawing the soda ash in through pipelines, conservationists worry it could still upset the natural water cycle and breeding grounds. For now, though, life prevails—even in a lake that kills almost everything it touches.
What may be the consequence of Tanzanian government’s planned operation?
选项
A、The accelerated extinction of flamingos.
B、The change of flamingos’ migration route.
C、The overmining of Lake Natron’s soda ash.
D、The disruption of Lake Natron’s ecosystem.
答案
D
解析
推理判断题。最后一段第一句指出,这个独特的生态系统可能很快就会面临压力。紧接着第二句说明原因:坦桑尼亚政府再次开采该湖的纯碱,用于制造化学品、玻璃和洗涤剂。第三句则指出尽管规划的工厂将位于40多英里之外,通过管道抽取纯碱,但环保主义者担心它仍会破坏天然的水循环和繁殖地。由此可知,坦桑尼亚政府规划的工厂带来的后果可能是对纳特龙湖生态系统的破坏,故答案为D)。
转载请注明原文地址:https://kaotiyun.com/show/MaP7777K
0
大学英语六级
相关试题推荐
A、Lookinthemirroranddotheself-talk.B、Getwellpreparedbeforemakinganychange.C、Makealittlechangesintheirlifest
A、Makingasummaryofthosejobs.B、Avoidingthewrongrecords.C、Introducingeverythingofthosejobs.D、Emphasizingthesalary
A、Thesoundofwavesistoonoisy.B、Theexperimentmaypollutethewater.C、Thesoundofwavesmayharmseaanimals.D、Thesea
TheHistoryofChineseAmericans[A]ChinesehavebeenintheUnitedStatesforalmosttwohundredyears.Infact,theChines
It’sagoodideatoapplysunscreenbeforeheadingtothebeachifyoudon’twanttoburn.Butformarineanimalslikewhales,t
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Peopletravelinglongdistancesfrequentlyhavetodecidewhethertheywouldprefertogobyland,sea,orair.Hardlycananyon
Peopletravelinglongdistancesfrequentlyhavetodecidewhethertheywouldprefertogobyland,sea,orair.Hardlycananyon
随机试题
简述Word2010中“文件”功能区提供的对文件的操作功能。
其是一种基本的统计推断形式,并且是数理统计学的一个重要分支的是
酚的毒作用机制主要是
治疗积聚气机阻滞证,应首选
担保物权的功能不包括()。
资料:(1)某工业企业大量生产A、B两种产品。生产分为两个步骤,分别由第一、第二两个车间进行。第一车间是机加工(包括设备调整作业、加工作业、检验作业、车间管理作业),第一车间为第二车间提供半成品,第二车间为组装(包括组装、检验、包装、车间管理作业
某企业为了确保产品质量,选择合适的供应商,决策层对供应商的管理有以下认识:供应商业绩的评价指标主要有_________。
小学班主任工作的中心环节是(‘)。
下列对“天空赤热”的解释,最准确的一项是:对文中加点的“非正常状态下的这种动物”理解不正确的一项是:
Probablyforaslongastherehavebeensalesforces,managershavesoughtwaystodeterminewhethertheyareeffectiveornot.
最新回复
(
0
)