单项选择题

When did Post office in Britain employ cats

A．In 1868.
B．In 1886.
C．In 1898.
D．In 1889.
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In 1066, Britain was conquered by ______.
A．Rome
B．Portman
C．Vikings
D．Norman
单项选择题
What is not the element in defining language
A．Systemic.
B．Arbitrary.
C．Symbol.
D．Visual.
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