垂死的鸟 – 1 级
28-08-2024 15:00
科学家在美国和加拿大研究鸟类。从 1970 年至今，33% 的鸟类死亡。
这相当于近 30 亿只鸟。鸟类因人类而死亡。有人时，鸟类的死亡速度是无人时的 1000 倍。
您可以在三级部分观看原始视频。
从 1970 年至今，死亡的鸟类占鸟类总数的百分比是多少？
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Reading
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