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【简答题】
腔肠动物门的分纲---珊瑚纲（5）____是构成珊瑚礁和珊瑚岛的主要成分。
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【单选题】Water— the Issue of This Century The world is running short of fresh water．Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏)．Half t...
A.
Right
B.
Wrong
C.
Not mentioned
【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
相关题目：
【单选题】Water— the Issue of This Century The world is running short of fresh water．Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏)．Half t...
A.
Right
B.
Wrong
C.
Not mentioned
【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
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