单项选择题

According to the passage, modern industry must have developed ______ .

A．before the Middle Ages
B．about in the nineteenth century
C．in Greece or Rome
D．machines to take tests
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单项选择题
In the Middle Ages, students ______.
A．took objective tests
B．specialized in one subject
C．sat in a room full of candidates
D．never wrote in exams
单项选择题
If one wants to work more efficiently at his low point in the morning, he should ______
A．change his energy cycle
B．overcome his laziness
C．get up earlier than usual
D．go to bed earlier
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