题目内容：
听录音，回答以下问题：What does the speaker say about the ocean's level of saltiness? A．The level of saltiness in the ocean is extraordinarily high．
B．The average level of salinity in the ocean is higher than that of inland lakes．
C．Salt has been gradually accumulating in the ocean．
D．Salt has accumulated very quickly at the early stage of life formation．
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答案解析：