单项选择题

It may be concluded that testing ______.

A．should deal with only opinions
B．should always be written
C．has changed since the Middle Ages
D．is given only in factories
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单项选择题
The figure of illiteracy in Britain comprises ______.
A．zero point one percent of that of illiteracy in the world
B．zero point two percent of the world's adult population
C．thirty-five percent of Europe's population
D．three point five percent of that of the illiteracy in Southern Europe
单项选择题
Which of the following statements is NOT true
A．Getting off to work with a minimum effort helps save one's energy.
B．Dr. Kleitman explains why people reach their peaks at different hours of day.
C．Habit helps one adapt to his own energy cycle.
D．Children have energy cycles, too.
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