题目内容
Britain declined in _________
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Britain was the first country to start the Industrial Revolution which contributed to the establishment of the British Empire.
The Second Industrial Revolution turned Britain into the “workshop of the world”.
The Third Industrial Revolution took place after World War Ⅰ.
元组 t=(1,(2,3),(4,[5,6,7,])) 的元素个数（即 len(t)）为（）
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