3.B【解析】调水调沙后,下游及河口地区水量在特定时期内相对增加,湿地内淡水资源得到补充,有效缓解黄河口湿地面积的缩小和盐碱程度的加剧因此B选项符合题意。从图中看,年径流量呈波动上升趋势、年总输沙量先下降,后波动上升,因此②错误;海岸线向外有所延伸,④错误。故选B。
书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!
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