A. Tilapia 定位至全文第四段第二句 ， 3/4的罗非鱼能够幸存在那里一些时候 。鱼类有着庇护所在小溪中并且他们能够去到泻湖里当湖水低并且泻湖是分离的时候 ， H说 。当水位高时 ， 所有泻湖联合在一起 ， 鱼类必须撤回到他们的小溪避难所中 ， 否则他们就会死亡 。
"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."
50. What may be the consequence of Tanzanian government\'s planned operation?
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.
D. 全文最后一段第一句 ， 这种独特的生态系统面临压力 。原因就是紧接第二句 ， 政府计划 。同时末段第三句 ， 虽然计划位置为40英里外 ， 但环保主义者们依然担心它会影响生态系统和繁殖区域 。所以正选为D项 。
Passage Two
Questions 51 to 55 are based on the following passage.
It is the season for some frantic last-minute math across the country,employees of all stripe are counting backward in an attempt to figure out just how much paid time-off they have left it their reserves. More of them, though, will skip those calculations altogether and just power through the holidays into 2017: More than half of American workers don\'t use up all of their allotted vacation days each year.
Not so long ago, people would have turned up their noses at that kind of dedication to the job. As marketing professors Silvia Bellezza, Neeru Paharia, and Anat Keinan recently explained in Harvard Business Review (HBR), leisure time was once seen as an indicator of high social status, something attainable only for those at the top. Since the middle of the 20th century, though, things have turned the opposite way – these days, punishing hours at your desk, rather than days off, are seen as the mark of someone important.
In a series of several experiments, the researchers illustrated just how much we\'ve come to admire busyness, or at least the appearance of it. Volunteers read two passages, on about a man who led a life of leisure and another about a man who was over-worked and over –scheduled; when asked to determine which of the two had a higher social status, the majority of the participants said the latter. The same held true for people who used products that implied they were short on time: In one experiment, for example, customers of the grocery-delivery service Peapod were seen as of higher status than people who shopped at grocery stores that were equally expensive; in another, people wearing wireless headphones were considered further up on the social ladder than those wearing regular headphones, even when both were just used to listen to music.
51. What do most employees plan to do towards the end of the year?
A) Go for a vacation. C) Set an objective for next year.
B) Keep on working. D) Review the year\'s achievements.
A. 第一段末句 ， 尽管许多假期没休 ， 但他们不再算计这件事情 ， 直接将假期推到下一年 。
52.How would people view dedication to work in the past?
A) They would regard it as a matter of course.
B) They would consider it a must for success.
C) They would look upon it with contempt.
D) They would deem it a trick of businessmen.
C 。第二段第一句话说 ， 不久之前 ， 人们会轻视那些沉迷工作的的情况 。
53. What did the researchers find through a series of experiments?
A) The busier one appears, the more respect one earns.
B) The more one works, the more one feels exploited.

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