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efficient
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单项选择题
A．The shortage of water,B．The shortage of food.C．The condition of weightlessness.D．The great pressure outside the spacecraft.
A．The shortage of water,
B．The shortage of food.
C．The condition of weightlessness.
D．The great pressure outside the spacecraft.
单项选择题
A．Six.B．Seven.C．Eight.D．Nine.
A．Six.
B．Seven.
C．Eight.
D．Nine.
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