题目内容：
The salt concentration in the liquid water of Lake Vida__________．
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 sheet 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 ic
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