单项选择题

According to the author, it is hard to imagine a workable society without（）

A．a recognized authority
B．enough money
C．examples
D．changes

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单项选择题
It can be inferred from the passage that we have to carry out our tasks（）

A．by learning from Indian' s way of doing things
B．by raising questions time and again
C．as quickly as we can
D．as slowly as we can
单项选择题
Modern industry must have developed （）

A．before the Middle Ages
B．around the 19th century
C．in Greece or Rome
D．machines to take tests
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