简述对实验变量分析和处理的内容。
(1)自变量的选定与操纵; (2)因变量的确定与观测;(3)无关变量的分析与控制。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Without a valid visa, no ( ) will be allowed to enter the country. (tour)
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