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Worrisome
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What is the passage mainly concerned
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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.
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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