单项选择题

The author mentions all of the following inventions as examples of dramatic technological innovations EXCEPT the

A．sewing machine
B．vacuum cleaner
C．typewriter
D．telephone
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单项选择题
From the passage we know that the development of high technology is in the interests of______.
A．the rich countries
B．scientific development
C．the elite
D．the world economy
单项选择题
It can be inferred from the passage that______.
A．international trade should be expanded
B．the interests of the poor countries have not been given enough consideration
C．the exports of the poor countries should be increased
D．communications technology in file developing countries should be modernized
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