Modern methods ______ tracking polar bear populations have been employed only since the mid-1980s, and are expensive ______ (perform) consistently over a large area. (用适当的词填空)
2022高三下·全国·专题练习 查看更多[2]
（已下线）考点 13 非谓语动词（一）（核心考点精讲练）-备战2023年高考英语一轮复习考点帮（全国通用）（已下线）第02讲 代词、介词和介词短语（测）-2023年高考英语一轮复习讲练测（全国通用）
更新时间：2022-07-10 09:56:58
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