听录音,准确填出划线部分的单词或词组,点击填空答案,显示正确答案!
Science is done _ . First an idea is formed. Then this is tested by an _.The outcome, one hopes, results in an increase in _.
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听录音,准确填出划线部分的单词或词组,点击填空答案,显示正确答案!
Science is done _ . First an idea is formed. Then this is tested by an _.The outcome, one hopes, results in an increase in _.