Some scientists believe that Adelie penguins may be______of global warming, that

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问题 Some scientists believe that Adelie penguins may be______of global warming, that their population decline may presage climatic changes throughout Antarctic.

选项

答案 D,E

解析 逗号说明前后同义重复。空格与presage(预兆)同义重复。figment幻觉,purveyor供应者,derivative衍生物,herald预兆,harbinger预兆,by-product副产品。答案选DE。注:这里derivative和by—product是干扰项,同表示“副产品”。
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