单项选择题

A．Manager and employee.
B．Salesman and customer.
C．Guide and tourist.
D．Professor and student.
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单项选择题
The author provides a sustained argument to support the assertions that ______.
A．profitability is neither necessary nor sufficient for a new technology to be adopted
B．profitability is the key factor guiding technological change
C．opaque-2-maize is of limited benefit to poor families in developing countries
D．economic factors and governmental policies strongly influence the ultimate success of any innovation
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