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单项选择题
A．They are found under the oceans.B．They were most active when earth was first formed.C．Their emissions created earth’s atmosphere.D．Their fumes are mostly water in the state nfs gas.
A．They are found under the oceans.
B．They were most active when earth was first formed.
C．Their emissions created earth’s atmosphere.
D．Their fumes are mostly water in the state nfs gas.
单项选择题
A．It involved a few lunches.B．There were free lunches.C．There were three lunches.D．There were more than free lunches.
A．It involved a few lunches.
B．There were free lunches.
C．There were three lunches.
D．There were more than free lunches.
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