题目内容
【多选】生物样品测定前要进行预处理，因为（）。
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everyone got excited with the grand (celebration) of the 70th anniversary of the founding of the People's Republic of China.
Chinese people are famous for their kindness and (hospitality).
When all the lost things were (presented) to the owner by the police, he could hardly believe it was true.
The newly elected president was popular among his people for his dynamism and (vitality).
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