单项选择题

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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单项选择题
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.
单项选择题
A．The effect of ordinary aspects of life on anthropology.B．A good source of information about a society.C．Attitudes toward culture in the 1940’s.D．The relationship between anthropology and military.
A．The effect of ordinary aspects of life on anthropology.
B．A good source of information about a society.
C．Attitudes toward culture in the 1940’s.
D．The relationship between anthropology and military.
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