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In this exercise, ...

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... learners are asked to detect a real smile.

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This is inherently challenging and engaging ...

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... and makes learners want to ...

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... read the article that follows, ...

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... about real and false smiles. 

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To check understanding ...

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... of what they have read, ...

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... learners receive guiding feedback on each answer, ...

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... not just correct/incorrect feedback.

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Learners then choose ...

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... the best summary of the article ...

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... before focusing on useful language it contains.