2017年12月13日SAT考试每日一题(阅读).

　　为了让我们更好的适应SAT考试，SAT考试官网每天都会有SAT官方每日一题，下面是澳际小编为您整理的2016年12月13日SAT题目，是阅读题，让我们一起来看一看这道题目吧。

　　Critical Reading>Select an Answer

　　The recovery of southern sea otters appears to have taken an upturn, according to results from the annual California sea otter survey released by the U.S. Geological Survey. Yet despite an overall increase in sea otter abundance, sharks have been "taking a bite" out of the portion of the population that could fuel expansion into new areas.

　　"There's much more to the story here than the main finding would suggest," said Dr. Tim Tinker, a research ecologist who leads the USGS sea otter research program. "We are looking into various factors that may be affecting the survey results, including a boom in urchin abundance from Big Sur to Monterey that may explain the uptick in numbers in the range center, and high levels of shark bite mortality that are likely responsible for continued declines at the north and south ends of the range."

　　This year's survey results suggest an increasing trend over the last five years of almost 2 percent per year and the population index, a statistical representation of the entire population calculated as the three-year running average of census counts, has climbed to 3,054 from 2,711 in 2010. The growth is accounted for by an unexpected jump in numbers in the center of the sea otter's range, an area that spans from Monterey south to Cambria.

　　While the population index continues to trend upward, the northern and southern subsets of the population continue a five-year decline, dropping 2 percent and 3.4 percent per year, respectively, numbers consistent with increased shark bite induced mortality in these same areas.

　　Since the 1980s, USGS scientists have computed the annual population index and evaluated trends in the southern sea otter, "Enhydra lutris nereis," a federally listed threatened species found in California. For southern sea otters to be considered for removal from threatened species listing under the Endangered Species Act, the population index would have to exceed 3,090 for three consecutive years.

　　The lines on the graph represent the 3-year running average of the southern sea otter population in the north, central, and south coastal regions.

　　Adapted from Brian Hatfield and Tim Tinker, "Spring 2015 California Sea Otter (Enhydra lutris nereis) Census Results." Published in 2015 by US Geological Survey.

　　Based on the passage and the graph, what can reasonably be inferred about predatory shark activity in the south region?

　　(A) It steadily decreased between 2000 and 2003.

　　(B) It affected otters at a consistent rate between 2003 and 2006.

　　(C) It was more of a threat to sea otters in 2003 than in 2009.

　　(D) It was at its highest level in 2009.

　　澳际培训提醒各位参加准备sat考试的同学，仔细看完以上的sat考试官网题目，然后再看下面的SAT题目答案更有效哦。

　　答案：C

　　解析：

　　Choice C is the best answer. The passage states thatpredatory shark activity has been affecting thesouthern sea otter population in the south subsetsof the coastal range. The graph shows that in thesouth region, there were approximately 400 southern sea otters in 2003 and roughly 700southern sea otters in 2009. Taken together, this information suggests that predatory sharkactivity was more of a threat to sea otters—and decreased their population more—in 2003than in 2009.

　　以上就是澳际小编为根据SAT考试官网最新信息，为您整理的2016年12月13日SAT题目，目的是为了让我们更好的适应SAT考试，如果在备考过程中遇到任何问题，欢迎随时咨询澳际培训，为您提供最专业、最全面的解答。

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