单项选择题

The last paragraph is mainly about______.

A．the cost of advertising a product
B．the effect of advertisement on people's lives
C．the benefits advertisement brings
D．various media for advertising products

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单项选择题

Person-to-person sale failed to meet the need______.

A．when the Industrial Revolution started
B．when goods began to be produced in great quantities
C．because trains replaced men in carrying goods around
D．as attention was shifted from distribution to production

单项选择题

All of the following statements about pattern Ⅱ children express differences EXCEPT ______.

A．they migrate for part of each year
B．they spend less time contributing to family income
C．they spend more months on school
D．their parents sometimes work at jobs other than farming