The study published in the journal Nature indicates that ______. It can be inferred from the last paragraph that scientists

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问题 The study published in the journal Nature indicates that ______.
It can be inferred from the last paragraph that scientists

选项 A、are puzzled by the mystery of forest pollution
B、feel relieved by the use of unleaded gasoline
C、still consider lead pollution a problem
D、lack sufficient means to combat lead pollution

答案C

解析 最后一段的大意为:"科学家们说,这两项研究表明,当大气污染状况减轻时,生态系统某些部分很快就能感受到。但同时表明,这些研究结果不应成为我们污染环境的理由"。据此可以推断科学家依然认为铅污染是个问题,C项正确。A项说"(科学家们)对森林污染之谜感到迷惑不解";B项说"(科学家们)因为无铅汽油的使用而如释重负";D项说"(科学家们)缺乏解决铅污染的手段"。这3项无法从文章中推出或与文章意思不符。
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