单项选择题

If a person finds getting up early a problem, most probably ______

A．he is a lazy person
B．he refuses to follow his own energy cycle
C．he is not sure when his energy is low
D．he is at his peak in the afternoon or evening

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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

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