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【单选题】
珊瑚礁有“海上长城”之美誉的主要原因是( )。
A.
珊瑚礁可以抗风阻浪，保护海岸线免受海浪侵蚀
B.
珊瑚礁连在一起有长城的形状
C.
珊瑚礁可以抵挡动物入侵
D.
珊瑚礁上有很多植物
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A.
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B.
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C.
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B.
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