单项选择题

A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.
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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.
单项选择题
Who is most likely to be the author of the passage
A．A politician.
B．An artist.
C．A doctor.
D．A salesman.
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