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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self-conscious
单项选择题
A．To encourage them.B．To stop them immediately.C．To give some explanation.D．To leave them alon
A．To encourage them.
B．To stop them immediately.
C．To give some explanation.
D．To leave them alon
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