A．Neither of the two types of rockets is very economica-找考题网

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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.

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What is the passage mainly concerned

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Some European countries are restricting the planting and importation of GM agricultural products because GM crops could pose unique risks to the environment and to health.

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