单项选择题

A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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单项选择题
A．76.B．54.C．92.D．58.
A．76.
B．54.
C．92.
D．58.
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.
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