单项选择题

A．We will not have enough food to eat.
B．All the oil that drives our cars will be used up.
C．The earth will become too crowded.
D．There will be little water left on Earth.
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A．The way to ensure the survival of the human race on Venus.B．The way to breed organisms on Venus.C．The way to reduce the population of the Earth.D．The way to conquer the universe.
A．The way to ensure the survival of the human race on Venus.
B．The way to breed organisms on Venus.
C．The way to reduce the population of the Earth.
D．The way to conquer the universe.
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