4. Regular physical activity is a healthy habit. ____________, a sedentary lifestyle is often perceived as detrimental to personal wellbeing.

Question

BlackTom AI · Accepted Answer

Conversely signals a contrast between two statements, so it is the appropriate choice.

1. Relevant knowledge points and concepts
- Transition words: their role is to show relationships (contrast, addition, similarity) between sentences or clauses.
- Meaning of options: "But" (contrast, coordinating conjunction), "In addition" (adds/supports), "Likewise" (similarity), "Conversely" (indicates the opposite or reverse relationship).
- Logical relation in the sentences: Regular physical activity is healthy; the next sentence must present the opposing idea (a sedentary lifestyle is detrimental).

2. Step-by-step reasoning
- Identify the relationship between the two sentences: the second sentence presents an opposite idea to the first (activity = healthy vs. sedentary = detrimental).
- Choose a transition that explicitly marks opposition or reversal.
- Evaluate options against that required relationship.

3. Intermediate “steps” (no numeric calculations)
- Test option a: "But" — works as a contrast word in many contexts, but it typically connects clauses directly (e.g., "Regular physical activity is a healthy habit, but a sedentary lifestyle...") Starting a new sentence with "But" is colloquial and would normally omit the comma used in the question.
- Test option b: "In addition" — signals addition, which conflicts with the intended contrast.
- Test option c: "Likewise" — signals similarity, which is the opposite of the needed meaning.
- Test option d: "Conversely" — explicitly signals the reverse relationship between the two ideas and fits the formal tone and punctuation shown ("Conversely, a sedentary lifestyle...").

4. Why the correct answer is correct
"Conversely" precisely marks that the second sentence is presenting the opposite situation to the first. It fits grammatically (followed by a comma) and semantically (opposite relationship), and it matches the formal register of the sentence pair.

5. Why the other options are incorrect
- a. But: Could contrast but is less appropriate given the sentence split and punctuation; sounds informal here.
- b. In addition: Incorrect because it indicates further similarity or support, not opposition.
- c. Likewise: Incorrect because it indicates similarity rather than contrast.

6. Conclusion
The correct choice is d. Conversely., which matches the provided answer.

4. Regular physical activity is a healthy habit. ____________, a sedentary lifestyle is often perceived as detrimental to personal wellbeing.单项选择题

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