Although most of the lakes have merged, salinity levels are not________throughout the lake system: an upward-trending salinity g

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问题 Although most of the lakes have merged, salinity levels are not________throughout the lake system: an upward-trending salinity gradient extends southeast from Pelican Lake to East Stump Lake, a distance of nearly 80 kilometers.

选项 A、known
B、equable
C、rising
D、problematic
E、unprecedented

答案B

解析 同义重复题。逻辑连接标志是冒号,表示前后同义重复。前面说尽管湖泊已经合并,但盐度水平(salinity levels)并不是(not)怎样的。冒号后面进一步解释,从Pelican Lake向东南延伸至East Stump Lake,盐度水平呈现一个向上的趋势(upward-trending salinity gradient),所以空格对upward-trending取反即可。因此空格表达“没有梯度”的含义,也就是比较均一,B项equable(平稳的,变化小的)符合。
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