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实验法并不象观察或访问法一样经常在营销调研中使用。
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The Black Death first started in .
The Black Death had swept through Europe decimating over one third of the population.
At the meeting with Wat Tyler, Richard III gave in to all of the demands and asked that they go home in peace.
The wage cut brought about by the Statute of Labourers of 1351 prompted many landowners to turn their fields over to sheep-farming.
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