Higher-quality versions of the answer key do not just give letters (A, B, C) but also provide short explanations for complex questions (e.g., inference or summary completion), which helps learners understand why an answer is correct.

Many students using Interaction 2 are preparing for standardized tests like the TOEFL, IELTS, or TOEIC. The reading passages in Interaction 2 mimic the complexity and question styles found in these exams. Students use the answer key not just to check answers, but to reverse-engineer the logic of the test makers. They analyze why an answer is "B" and not "A," turning the key into a study guide for exam strategies.

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