单项选择题

According to the passage, the use of Antarctic krill as a food is an innovation whose future is ______.

A．basically gloomy but still uncertain
B．somewhat promising but very tentative
C．generally bright and virtually assured
D．endangered by certain technical problems
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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
The primary purpose of the passage is to discuss ______.
A．the difficulties of applying technological solutions to the problem of food shortages
B．the means of assessing the extent of the world food shortage
C．the costs of introducing a new food technology into a developing country
D．the nature of the new technological innovations in the area of food production
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