单项选择题

What can we infer from this discussion

A．That Bob does not get along with his lab partner.
B．That the students performed the experiment correctly.
C．That the students had problems, and could not complete the lab experiment.
D．That there was a fire in the lab during the experiment.

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单项选择题

What is the purpose of this class discussion

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

What was deposited on the bottom of the gas bottle

A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.