题目内容：
Scientists ignored Lake Vida because they thought that a lake of ice _____.
A．is found to be a great deal higher than that of seawater B．was of little scientific value
C．may be older than that collected below 39 feet of ice
D．might have come from Mars
E．is to collect some briny lake water for analysis
F．may return to life sooner than microbes frozen in the surface ice
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