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崇明岛位于长江入海口,是我国的第三大岛,也是一个面积不断增大的沙岛。读“崇明岛东滩成陆线和大堤随时间的变化图”,回答下列各题:

崇明岛东滩陆地面积扩大的大致方向和原因是                      (    )

A.向东北流水沉积 B.向西南海浪堆积
C.向东地壳抬升 D.向南流水侵蚀

自1998年的新大堤建成后就几乎没有再进行造堤工程,崇明岛东滩的潮滩淤积也有所减缓,其原因是                                              (    )
①不断实施围垦造陆               ②长江三峡工程的建设 
③长江水流速度明显加快           ④长江中上游防护林的建设

A.①③ B.②④ C.②③ D.①④
科目 地理   题型 选择题   难度 中等
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