雁荡山景点介绍a protect 英语试讲
净化水
The as and oceans receive the brunt of human waste,whether it is by deliberate dumping or by natural run-off from the land.
精彩茶言
In fact over 80%of all marine pollution comes from land-bad activities and many pollutants are deposited in estuaries and coastal waters.Here the pollutants enter marine food chains,building up their concentrations until they reach toxic levels.It often takes human casualties to alert us to pollution and such was the ca in Minimata Bay in Japan when many people died as a result of a pollutant building up in food chains.A factory was discharging waste containing methyl mercury in low concentrations into the a and as this pollutant pasd through food chains it became more concentrated in the tissues of marine organisms until it reached toxic levels.
读书时代As a conquence 649 people died from eating fish and shellfish contaminated with mercury and 3500 people suffered from mercury poisoning.儿童百日咳
防暑降温措施管理办法>解决问题英文>口部首的字
