By
tracking
tracking
（track） people's e-mails and online posts，scientists have found that good news can spread faster and farther than disasters and sob stories.

【答案】tracking

【解答】

【点评】

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发布：2024/4/20 14:35:0组卷：5引用：1难度：0.7

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By trackingtracking （track） people's e-mails and online posts，scientists have found that good news can spread faster and farther than disasters and sob stories.