单项选择题

According to the passage, what was invented in Delaware

A．Constitution
B．Nylon
C．Wheat
D．Corn
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单项选择题
During which period did mathematics remain unchanged
A．Ancient times
B．The 17th century
C．For 300 years
D．The Dark Ages
单项选择题
Which national channel of the BBC broadcasts spots programs
A．Radio One.
B．Radio Two.
C．Radio Three.
D．Radio Four.
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