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A．Argentina.
B．Paraguay.
C．Sweden.
D．France.
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A．To examine the chemical elements in the Ice Age.B．To look into the pattern of solar wind activity.C．To analyze the composition of different trees.D．To find out the origin of carbon-14 on Earth.
A．To examine the chemical elements in the Ice Age.
B．To look into the pattern of solar wind activity.
C．To analyze the composition of different trees.
D．To find out the origin of carbon-14 on Earth.
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