30. What is the main purpose of the lecture?

Question

BlackTom AI · Accepted Answer

The lecturer's primary aim is to review existing knowledge about genetically modified (GM) food.

1) Relevant knowledge points and concepts
- Purpose types: informative/review (summarize current findings), investigative/research (present new experiments or propose methods), persuasive/warning (advocate a position or highlight dangers).
- Typical signals of a review lecture: summarizing multiple studies, comparing results, noting strengths and weaknesses of evidence, and pointing out unresolved questions rather than presenting new experimental work or issuing an alarmist call to action.

2) Step-by-step reasoning
- Identify tone and content: the lecture summarizes what researchers have found about GM food — listing both potential benefits and concerns, citing studies, and explaining limitations of current evidence. These are hallmarks of a review.
- Exclude the research option: the lecturer does not describe conducting new experiments, collecting new data, or proposing a specific research protocol; instead, she synthesizes existing studies. That rules out “to research the pros and cons” (option a), which implies primary research activity.
- Exclude the warning option: although risks may be discussed, the speaker does not take a one-sided, alarmist stance urging the public to avoid GM foods; instead, the talk weighs evidence neutrally and highlights gaps and consensus. That rules out “to warn the public” (option c).

3) Intermediate logical steps
- Lecture content = synthesis of studies + balanced discussion → purpose = review.
- No presentation of novel experimental methods or data → not research.
- Balanced tone, not persuasive alarmism → not primarily a warning.

4) Why the correct answer is correct
Because the speaker’s goal is to summarize and clarify what is currently known (and not known) about GM food — presenting existing evidence, comparing studies, and identifying uncertainties — the main purpose is to review that body of knowledge.

5) Why other options are incorrect
- a. Incorrect: implies the lecture presents or conducts original research; it does not.
- c. Incorrect: implies a primary intent to alarm or persuade the public against GM food; the lecture remains balanced and evaluative.

Conclusion: The main purpose is indeed to review what is known about GM food, matching answer b.

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

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