单项选择题

"Vanguard" in the last sentence of the third paragraph may probably mean ______.
   A．importance    B．history
   C．pioneer    D．industry

A.

B.importance
C.history

D.pioneer
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商品流通的公式是G—W—G。（）
单项选择题
Which of the following items is not the contribution of Turing? A．Turing Award. B．Turing Machine. C．Turing Test. D．The plan for ACE.
A.Turing
B.Turing
C.

D.Turing
E.The
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