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A．Because every species becomes extinct.
B．Because humans beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exptoiting the environment.
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A．Nineteenth-century sea captains.B．The development of the steamship.C．The economic importance of sailing ships.D．Employment in the fishing and whaling industries.
A．Nineteenth-century sea captains.
B．The development of the steamship.
C．The economic importance of sailing ships.
D．Employment in the fishing and whaling industries.
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