单项选择题

This passage is mainly about______.

A．the advantages of an economy based on farming
B．reasons farmers continued using river transportation
C．the role of cotton in the US economy
D．improved methods of transporting farm crops
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单项选择题
This passage is mainly about______.
A．the advantages of traditional surveying methods
B．using satellites to communicate with mountain climbers
C．obtaining new information about a mountain
D．controlling satellites from the top of a mountain
单项选择题
According to the speaker, ______make up the illiterate population
A．women
B．prisoners
C．manual workers
D．school children
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