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多赢彩票

2016-02-19    ????:?ó????    ?? ??     

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????????????±???These are Chinese mitten crabs,named for their strange hairy claws.They may migrate as much as 1,500 kilometres from tributaries and lakes to the river mouth,they gather to breed.A similar migration is made by the giant Yangtze sturgeon,which can reach four metres long and weigh half a ton.In recent years,its numbers have declined dramatically as its migration is impeded by ever more river dams.But it isn't just animals like the sturgeon that are in trouble,the entire Yangtze River ecosystem is being poisoned.In spite of being the subject of an ambitious clean-up plan,today the river is reckoned to be the biggest single source of pollution entering the Pacific Ocean.

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