单项选择题

A．20,000
B．26,000
C．30,000
D．36,000
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单项选择题
A．The presence of life-forms far below the Earth’s surface.B．The risk of infection from rare strains of bacteria.C．Fictional representations of a hidden underground world.D．The reliability of evidence collected by new drilling methods.
A．The presence of life-forms far below the Earth’s surface.
B．The risk of infection from rare strains of bacteria.
C．Fictional representations of a hidden underground world.
D．The reliability of evidence collected by new drilling methods.
单项选择题
A．basisB．normC．ruleD．variety
A．basis
B．norm
C．rule
D．variety
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