高中英语第三册Lesson26Protecting the Sea课件
China has been experiencing increasing red tides off the Chinese coast since the 1990s due to increasing pollution caused by industrial waste.
According to an official report, during the past 20 years , a total of 200 red tides have been registered（经正式鉴定的）causing 240 million U.S. dollars in direct economic losses. The 45 major red tides occurred in the Bohai Sea, the Yellow Sea, the East
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