单项选择题

______ is well-known for its important role in the American space navigation program.

A. Atlanta
B. Houston
C. Seattle
D. Dallas
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What is not the element in defining language
A. systemic

B. arbitrary
C. symbol

D. visual
单项选择题
The famous _____ Gold Rush began in the U. S. in the mid-nineteen century.
A. New York State
B. California
C. Pennsylvania
D. Texas
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