Modernmethods ________ tracking polar bear populations have been employed only s-组卷网

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Modern methods ________ tracking polar bear populations have been employed only since the mid-1980s, and are expensive to perform consistently over a large area. （用适当的词填空）

2019高三·全国·专题练习

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Modern methods ________ tracking polar bear populations have been employed only since the mid-1980s, and are expensive to perform consistently over a large area. （用适当的词填空）

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