单项选择题

A．It has a very long history.
B．It is a private institution.
C．It was founded by Thomas Jefferson.
D．It stresses the comprehensive study of nature.
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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
单项选择题
The navigation computer functions ____________.
A．by means of a direction finder and a speed detector
B．basically on satellite signals and a map database
C．mainly through the reception of turn-by-turn directions
D．by using a screen to display satellite signals
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