单项选择题

From the Paragraph 1, we can see that beginning in the 1970s ______.

A．income became more unequal
B．income became more equal
C．income became more unstable
D．income became more stable

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单项选择题

Which of the following statements is true

A．The long-run increase in income inequality is caused by the wage distribution.
B．Fewer goods-producing industrial workers will be employed.
C．Not enough college students are employed by different services.
D．Less educated workers have become more important.

单项选择题

According to the writer, intensifying global competition and immigration will ______.

A．reduce the proportion of union workers
B．reduce the real value of the minimum wage
C．increase the use of temporary workers
D．make the wages of less-educated workers go down

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