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  3. 　　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】__

　　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.
【B7】
选项 A、manipulated
B、dominated
C、predicted
D、prevailed
答案[B]
解析 本题考查动词辨析。四个选项分别为[A]manipulated“(暗中)控制，操纵，影响；(熟练地)操作，使用”；[B]dominated“支配，控制，左右，影响，在……中具有最重要(或明显)的特色”；[C]predicted“预测”；[D]prevailed“普遍存在，盛行，流行，战胜，压倒”。文章开头指明从河流的颜色可以看出河水中流淌着什么，从软绿色的藻类到黄褐色的泥。结合所给单词选项和句子意思，dominated意为“支配，控制，左右，影响，在……中具有最重要(或明显)的特色”，可以引申理解为该国的河流主要是富含黄色的沉积物(56％)和绿色的藻类(38％)。故选项[B]正确。
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