首页
登录
职称英语
At the base of a mountain in Tanzania’s Gregory Rift, Lake Natron burns brigh
At the base of a mountain in Tanzania’s Gregory Rift, Lake Natron burns brigh
游客
2024-03-11
10
管理
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. [br] Why can certain species of tilapia sometimes survive around Lake Natron?
选项
A、They can take refuge in the less salty waters.
B、They can flee quick enough from predators.
C、They can move freely from lagoon to lagoon.
D、They can stand the heat of the spring water.
答案
A
解析
事实细节题。第四段第一句提到,也有些鱼,能偶尔成功地在纳特龙湖待上一段时间,因为咸度较低的泻湖是在流入纳特龙湖的温泉外缘形成的。紧接着第二句具体指出三种罗非鱼会有部分时间在那里成长。由此可知,这三种罗非鱼有时能生存在纳特龙湖周围,是因为泻湖的咸度较低,故答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3525169.html
相关试题推荐
AtthebaseofamountaininTanzania’sGregoryRift,LakeNatronburnsbrigh
AtthebaseofamountaininTanzania’sGregoryRift,LakeNatronburnsbrigh
AtthebaseofamountaininTanzania’sGregoryRift,LakeNatronburnsbrigh
AtthebaseofamountaininTanzania’sGregoryRift,LakeNatronburnsbrigh
山区mountainousarea
承德避暑山庄(theChengdeMountainResort)是中国现存最大的皇家园林(imperialgarden),位于河北省东北部的承德
攀登高山是重阳节一项重要的习俗,据说这样可以避免灾难,并且带来好运。Itiscustomarytoclimbahighmountaindurin
五岳(theFiveGreatMountains)是中国五大名山的总称。它们是东岳泰山、南岳衡山、西岳华山、北岳恒山、中岳嵩山。五岳虽不是最高的山
大兴安岭(GreatKhinganMountains)森林茂密,林地占730万公顷(hectare),森林覆盖率达74.1%。GreatKhinganM
A、Theyplantedmanytreesonmountains.B、Theyloweredtheircarbonemissions.C
随机试题
成功并不局限于你品格的某一方面,而是与你各部分潜能的发展相关。——acertainpartofyourpersonalitybutis——the
ThisiswhatAfricahasinabundance,space,almost12millionsquaremiles
Some23millionadditionalU.S.residentsareexpectedtobecomemoreregula
冬虫夏草的药理作用为A.对红斑狼疮的抑制作用 B.调节机体免疫功能 C.降血
长针深刺宜选A.指切进针法 B.夹持进针法 C.舒张进针法 D.提捏进针法
外部事件引起银行损失的范围非常广泛,不包括()。A.自然灾害 B.经济风险
有利于提高个体自尊水平的做法是()。 (A)与比自己年龄小的人比较(B)扬
甲公司为增值税一般纳税人,2021年度发生的有关交易性金融资产业务如下: (1
(2018年真题):某咨询企业接受A企业委托,对该企业2018年在目标市场空调产
一波阻抗为Z1=300Ω的架空线路与一波阻抗为Z2=60Ω的电缆线相连,当幅值为
最新回复
(
0
)