单项选择题

A．They were talking about a girl named Maryann.
B．Maryann is coming for a visit.
C．Hurricane Maryann is coming.
D．They were expecting someone.
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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
digital divide in the 4th paragraph refers to__________.
A．the gap in terms of computer ownership
B．the tendency of computer ownership
C．the dividing line based on digits
D．the ethnic distinction among American households
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