单项选择题


A．when
B．until
C．not until
D．while
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单项选择题
According to the author, technical terms are used because ______.
A．they describe a process in details
B．they can only be understood by people of a given profession
C．they can be found in almost every dictionary
D．they can be universally understood by people of a given profession
单项选择题
The author of this passage was probably a______.
A．linguist
B．scientist
C．politician
D．physician
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