单项选择题

The main idea of Paragraph Three is that ______ .

A．workers now take examinations
B．the population has grown
C．there are only written exams today
D．examinations are now written and timed
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单项选择题
In the Middle Ages students ______ .
A．took objective tests
B．specialized in one subject
C．were timed by electric clocks
D．never wrote exams
单项选择题
It may be concluded that testing ______ .
A．should test only opinions
B．should always be written
C．has changed since the Middle Ages
D．is given only in factories
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