单项选择题

A．To investigate the causes of AIDS.
B．To raise money for AIDS patients.
C．To rally support for AIDS victims in Africa.
D．To draw attention to the spread of AIDS in Asia.
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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
Despite their varied designs, navigation computers used in cars ____________.
A．are more or less the same price
B．provide directions in much the same way
C．work on more or less the same principles
D．receive instructions from the same satellites
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