单项选择题

A．They cant fit into the machine.
B．They have not been delivered yet.
C．They were sent to the wrong address.
D．They were found to be of the wrong type.
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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.
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.
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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