From the passage we learn that man dies in sea disasters mainly because ______. The main idea of the passage is ______.

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问题 From the passage we learn that man dies in sea disasters mainly because ______.
The main idea of the passage is ______.

选项 A、baby can stay" alive in cold water longer than adults
B、how to keep out the cold in water
C、how to float better in water
D、human beings came from semi-water apes

答案B

解析
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