Most environmental_____—from climate changes to freshwater and forest habitat loss—have become markedly worse.

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问题 Most environmental_____—from climate changes to freshwater and forest habitat loss—have become markedly worse.

选项 A、symptoms
B、highlights
C、indicators
D、symbols

答案C

解析 四个选项的意思分别是:indicators“标识,指示物”;symptoms“(疾病的)症状”;highlights“最好的部分”;symbols“符号,象征”。句意是,许多环境指标,从气候变化到淡水和森林栖息地的损失,已经恶化,并且越来越明显。所以正确答案是C选项。
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