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.
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单项选择题
A．Protecting buyers of paintings.B．Why copies of famous paintings are made.C．How paintings are sold in the United States.D．Protecting artists from others’ illegal use of their work.
A．Protecting buyers of paintings.
B．Why copies of famous paintings are made.
C．How paintings are sold in the United States.
D．Protecting artists from others’ illegal use of their work.
填空题
S5. The passage is primarily concerned with discussing________________.
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