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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 75percent 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 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 form 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.
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参考答案:
举一反三
【判断题】标准成本制度下,月末成本差异账户可以结清,也可以保留期未余额。( )
A.
正确
B.
错误
【单选题】构成血浆渗透压的主要成分是血浆中的
A.
纤维蛋白原
B.
球蛋白
C.
白蛋白
D.
氯化钠
E.
葡萄糖
【单选题】构成血浆渗透压的主要成分
A.
白蛋白
B.
葡萄糖
C.
球蛋白
D.
氯化钠
E.
胶体物质
【判断题】标准成本制度下,月末成本差异账户可以结清,也可以保留期末余额。
A.
正确
B.
错误
【单选题】构成血浆渗透压的主要成分
A.
球蛋白
B.
白蛋白
C.
NaCl
D.
KCl
【单选题】同上 My grandfather was born in .
A.
1913
B.
1930
【单选题】降压反射的生理意义是
A.
降低动脉血压
B.
减弱心血管活动
C.
维持动脉血压相对稳定
D.
调节血管容量
E.
降低心脏压力
【判断题】网络层具备网络拥塞处理的功能。
A.
正确
B.
错误
【单选题】学生在学习汉字时,看见“山”这个汉字,联想到高低起伏的山脉,这是( )。
A.
类似联想
B.
关系联想
C.
对比联想
D.
接近联想
【单选题】构成血浆渗透压的主要成分是
A.
血浆蛋白
B.
NPN
C.
NaC I
D.
葡萄糖
E.
NaHCO3
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