单项选择题

A．To put the homework on Don’’s desk.
B．To leave the master key for Don.
C．To give Don’’s students the next assignment.
D．To call Don at the end of the afternoon.
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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 doesn’’t know how to swim.B．The water was too deep.C．The water was too cold.D．She didn’’t have enough time.
A．She doesn’’t know how to swim.
B．The water was too deep.
C．The water was too cold.
D．She didn’’t have enough time.
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