单项选择题

Industrial products are often the result of ______ according to the passage.

A．laboratory work
B．market survey
C．commercial research
D．business growth
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单项选择题
How long does it take for some industries acquiring commercial potential
A．From five to ten years.
B．From six to eight years.
C．From seven to eleven years.
D．From eleven to eighteen years.
单项选择题
According to the passage, which of the following is not the benefit of a regular supply of new products
A．To enhance the company's status in customers.
B．To draw psychologists' attention.
C．To make full use of various resources.
D．To win increased profits and income.
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