单项选择题

By ______ we mean there is no logical connection between meanings and sounds

A. arbitrary
B. duality
C. displacement
D. productivity
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单项选择题
The climate of Britain may be generalized as ______.
A. changeable
B. rainy
C. foggy
D. moderate
单项选择题
The American Civil War broke out in ______.
A. 1860
B. 1861
C. 1862
D. 1863
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