30. What is the main purpose of the lecture?

Question

BlackTom AI · Accepted Answer

Illustrating the significance of the capital city is the central concept: the lecture’s purpose is descriptive and explanatory rather than argumentative or negative.

1) Relevant knowledge points and concepts
- Distinguish purposes of spoken texts: informative/illustrative (explain and describe), persuasive/argumentative (convince, advocate), and critical/negative (highlight drawbacks).
- Identify linguistic and organizational clues that indicate purpose: neutral explanatory tone, presentation of examples, historical or functional description point to illustration; evaluative language and calls to action point to argument; emphasis on problems or harms signals critique.

2) Step-by-step reasoning
- Step 1: Identify the tone and content type: if the lecturer explains roles, history, functions, and importance, the goal is to illustrate significance (informative).
- Step 2: Look for signals of advocacy: words like “should,” “must,” or comparative recommendations would indicate arguing in favour; these are absent.
- Step 3: Look for emphasis on negatives: repeated focus on problems, costs, or harms would indicate highlighting disadvantages; this is not the case.
- Step 4: Match the overall aim to the closest option: descriptive explanation aligns with option (a).

3) Intermediate “calculations” (logical checkpoints)
- Checkpoint A: Is the lecture primarily describing what a capital city does and why it matters? Yes → aligns with (a).
- Checkpoint B: Is the lecture trying to persuade listeners to adopt a position? No → rules out (b).
- Checkpoint C: Is the lecture focused on disadvantages? No → rules out (c).

4) Why the correct answer is correct
Option (a) fits because the lecture’s content is explanatory—showing significance through examples, functions, and context—without urging a policy or taking a negative stance. “Illustrate the significance” captures an informative, clarifying purpose.

5) Why the other options are incorrect
- (b) To argue in favour of capital cities: would require persuasive language and advocacy; not evident if the lecture is mainly explanatory.
- (c) To highlight the disadvantages of capital cities: would focus on negatives and criticisms; inconsistent with an explanatory emphasis on significance.

6) Conclusion
Therefore, the main purpose of the lecture is option a: To illustrate the significance of the capital city. This matches the provided correct answer.

30. What is the main purpose of the lecture?单项选择题

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