单项选择题

A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.
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单项选择题
A．Away from home.B．In the army.C．At a distant college.D．At home.
A．Away from home.
B．In the army.
C．At a distant college.
D．At home.
单项选择题
A．To discuss the results of the lab experiment.B．To answer Bob’s question about the lab experiment.C．To explain the method of collection by water displacement.D．To prepare the students to do the lab experiment.
A．To discuss the results of the lab experiment.
B．To answer Bob’s question about the lab experiment.
C．To explain the method of collection by water displacement.
D．To prepare the students to do the lab experiment.
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