被海水淹没，坡度较缓，陆地向海洋的自然延伸部分是
A．大陆架
B．大陆坡
C．海岭
D．大洋中脊
答案：A
题目分析：现代探测技术揭开了海底地形的神秘面纱，海底地形有大陆架、大陆坡、海沟、洋盆、大洋中脊等．陆地向海洋自然延伸的部分，坡度较缓，为大陆架，大陆架向外倾斜的陡坡，为大陆坡，海洋底部最深的地方，为海沟，大洋中新海底诞生的地方，为大洋中脊，故选A．
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