单项选择题

The renowned American linguist N. Chomsky in the late 1950's proposed the distinction between ______.

A．competence and performance
B．langue and parole
C．synchronic and diachronic
D．signified and signifier
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单项选择题
According to the passage, the National Cyber Security Division will be under the leadership of ______.
A．the Cyber Security Industry Alliance
B．the Department of Homeland Security
C．the Information Technology Association
D．the Critical Infrastructure Protection Board
单项选择题
Andy Purdy will directly answer to ______.
A．Tom Ridge
B．Michellq Petrovich
C．Paul Kurtz
D．Robert Liscouski
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