单项选择题

Special words used in technical discussion ______.

A．should be confined to scientific fields
B．should resemble mathematical formulae
C．are considered artificial speech
D．may become part of common speech

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单项选择题

What does the circular halo placed behind the head signify in the art of the Middle Ages

A．Divinity.
B．Sainthood.
C．God.
D．Sky.

单项选择题

It is true that ______.

A．the average man often uses in his own vocabulary what was once technical language not meant for him
B．various professions and occupations often interchange their dialects and jargons
C．there is always a clear-cut nontechnical word that may be substituted for the technical word
D．an educated person would be expected to know most technical terms