单项选择题

The word "liability" (Line 4, Para. i) most probably means"

A．misfortune
B．disadvantage
C．instability
D．burden
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单项选择题
It can be inferred from the passage that a scientist devoted himself to study the nature of the carbon dioxide likely belongs to those dedicated to______.
A．pure science
B．applied science
C．environmental science
D．ecological science
单项选择题
The word hypotheses (Line 3, Para. 2) can probably be replaced by______.
A．illusion
B．imagination
C．presumption
D．fabrication
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