30. What is the main purpose of the lecture?

Question

BlackTom AI · Accepted Answer

Distinguishing demonstration from advocacy: the lecturer repeatedly presents concrete, real-world examples and case studies of urban transport systems that function effectively, which indicates the main purpose is to show that working sustainable urban transport options are available.

1) Relevant knowledge points and concepts
- Main idea vs. supporting details: the main purpose is the overall aim the speaker returns to, not isolated facts. 
- Signals of purpose in lectures: repeated examples, illustrative case studies, practical evidence and phrasing like “this has been implemented” point to demonstration; normative language (“should,” “better than”) points to argument; speculative language (“could,” “potential”) points to outlining capabilities.

2) Step-by-step reasoning
Step 1: Identify recurring emphasis — the lecturer highlights multiple functioning systems (e.g., integrated bus networks, cycling infrastructure, successful pilot projects).  
Step 2: Note language and evidence — the speaker uses concrete outcomes, ridership numbers, implementation details, and lessons learned rather than arguing a superiority claim or only describing future possibilities.  
Step 3: Infer purpose — presenting several working examples and implementation details serves to prove feasibility and availability of sustainable options, so the intent is demonstrative.

3) Calculations / intermediate steps
(No numeric calculation is required; reasoning is qualitative. Intermediate logical steps: examples → practical evidence → demonstration of availability → purpose = show working options exist.)

4) Why the correct answer is correct
Answer b states the lecturer’s main purpose is “To show that working sustainable urban transport options are available.” Because the lecture centers on real, implemented solutions and their outcomes, its goal is to convince listeners these options are practical and in use now — matching answer b exactly.

5) Why other options are incorrect
- a ("To argue that public transport is more sustainable than private vehicles.") is incorrect because the lecture does not primarily compare or advocate public vs private transport morally or comparatively; it focuses on examples of workable systems.  
- c ("To outline the possible capabilities of sustainable transport.") is incorrect because outlining capabilities suggests speculative or potential futures; the lecture instead emphasizes existing, functioning implementations.

6) Conclusion
Therefore, the correct answer is b. This explanation confirms and supports the provided answer: To show that working sustainable urban transport options are available.

30. What is the main purpose of the lecture?Single choice

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