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A．To other European countries.
B．To the remote areas and suburbs.
C．To the natural parks for birds.
D．Back to their nests.
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A．The world in 2020 will be more crowded and more polluted than the world we live in now.B．In 2020 the world population could approach 8,500 million people.C．At the next ten years of the century, the available supplies will not be sufficient for our needs.D．The world will be worse.
A．The world in 2020 will be more crowded and more polluted than the world we live in now.
B．In 2020 the world population could approach 8,500 million people.
C．At the next ten years of the century, the available supplies will not be sufficient for our needs.
D．The world will be worse.
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