单项选择题

A．France.
B．Russia.
C．Poland.
D．Germany.
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单项选择题
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 wors
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 wors
单项选择题
A．Uses of cold sea water.B．Irrigating desert areas.C．Techniques for preserving the environment.D．Techniques of cultivating plants.
A．Uses of cold sea water.
B．Irrigating desert areas.
C．Techniques for preserving the environment.
D．Techniques of cultivating plants.
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