　　A river’s colors hold clues to what flows in its water, from soft-green algae to yellow-brown mud. Human eyes might miss【B1】__

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问题　　A river’s colors hold clues to what flows in its water, from soft-green algae to yellow-brown mud. Human eyes might miss【B1】________shifts in these shadings, but satellites can【B2】________them—and researchers can use them to track large-scale changes and【B3】________spot【B4】________of trouble.
　　A team led by University of Pittsburgh environmental scientist John R. Gardner analyzed 234,727 satellite images,【B5】________67,000 miles of U. S. rivers over 35 years. The researchers isolated the main light wavelength each river reflected,【B6】________ shifting colors into grids of numbers.
　　Gardner’s group found sediment-laden yellow (56 percent) and algal green (38 percent)【B7】________the country’s rivers. A third of them had changed color over the past few decades,【B8】________the fastest shifts often near sediment-trapping dams. This effect is clear and【B9】________
　　Western U.S. river colors【B10】________moved toward the blue end of the spectrum over time, suggesting they carried【B11】________sand and silt. But many rivers in the Northeast showed a "red shift" that made them appear more yellow, indicating lower water levels or【B12】________sediment. Gardner says this【B13】________suggests that regional factors, such as land-use patterns and watershed-management【B14】________, influence long-term river hue shifts.
　　"We also found very distinct【B15】________patterns," Gardner says. Many of the nation’s rivers turn yellower in spring or summer【B16】________peaking rainfall muddies the waters.【B17】________the timing also【B18】________geography and human activity such as【B19】________
　　Using satellites to gauge changes in river composition could warn scientists when environments begin to【B20】________balance, the researchers say.
【B13】

选项 A、divergence
B、similarity
C、connection
D、assimilation

答案[A]

解析本题考查名词辨析。四个选项分别为[A]divergence“差异，分歧”；[B]similarity“类似，相似点”；[C]connection“连接，关系”；[D]assimilation“吸收，同化”。根据上文，美国西部河流的颜色和东北地区的许多河流颜色出现了不一样的变化，这些变化和差异表明了地区因素对河流色调长期变化的影响。故选项[A]正确。

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考研英语一

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A river’s colors hold clues to what flows in its water, from soft-green algae to yellow-brown mud. Human eyes might miss【B1】__

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