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
单项选择题
A．She is unwilling to undertake them.B．She complains about her bad luck.C．She always accepts them cheerfully.D．She takes them on, though reluctantly.
A．She is unwilling to undertake them.
B．She complains about her bad luck.
C．She always accepts them cheerfully.
D．She takes them on, though reluctantly.
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