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【单选题】

珊瑚砂是由多孔的珊瑚礁长期破碎和风化作用形成,其主要特点不包括( )

A.
磨圆度差
B.
形状规则
C.
棱角分明
D.
孔隙较多
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参考解析:
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【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...

A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the danger of being eaten by sharks
D.
most sea creatures feed on the colourful coral

【单选题】()是海南岛海岸珊瑚礁的主要类型。

A.
平直岸礁
B.
海湾岸礁
C.
泻湖岸礁
D.
小岛岸礁