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Article analysis:

The article is generally reliable and trustworthy, as it provides factual information about Duolingo and its features. However, there are some potential biases that should be noted. For example, the article does not explore any counterarguments or alternative methods of learning English, nor does it provide evidence for the claims made about Duolingo's effectiveness. Additionally, the article could be seen as promotional content due to its focus on Duolingo's features and lack of exploration of other options for learning English. Furthermore, the article does not present both sides equally; instead, it focuses solely on the positives of using Duolingo without noting any possible risks or drawbacks associated with it. Finally, there are some missing points of consideration that could have been explored in more detail such as how long it takes to become proficient in English using Duolingo and what other resources may be needed in addition to Duolingo in order to achieve fluency.