bộ 20 câu hỏi trắc nghiệm TOEFL nâng cao chuyên sâu, T: Reading, Listening (giả lập), Grammar & Vocabulary nâng cao, và Inference/Paraphrasing #9

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1–5. Reading – Academic Passage

Topic: Photoperiodism in Plants

Photoperiodism is the physiological reaction of organisms to the length of day or night. In plants, it determines flowering time. Plants are categorized as short-day, long-day, or day-neutral, depending on how they respond to daylight duration. Short-day plants flower when nights exceed a critical length, while long-day plants flower when nights are shorter than this threshold. Interestingly, it is the length of the night — not the day — that most plants measure.
Phytochrome, a light-sensitive protein, plays a crucial role in detecting these changes. Red light and far-red light affect the balance between two forms of phytochrome, triggering or inhibiting flowering responses.

1. What is the primary focus of the passage?
A. The difference between light and darkness
B. The types of nutrients required by flowering plants
C. How plants respond to changes in night length
D. The way animals adapt to seasons
✅ Answer: C
Giải thích: Toàn đoạn tập trung vào phản ứng của thực vật với độ dài đêm (photoperiodism).

2. According to the passage, which light condition triggers flowering in short-day plants?
A. Long days
B. Extended nights
C. Constant light
D. Sudden darkness
✅ Answer: B
Giải thích: Short-day plants flower khi đêm dài vượt ngưỡng nhất định.

3. The passage implies that:
A. Day-neutral plants need complete darkness
B. Plants measure night length using specialized proteins
C. Phytochrome causes leaf decay
D. Far-red light prevents photosynthesis
✅ Answer: B
Giải thích: Phytochrome được đề cập là yếu tố nhạy sáng giúp nhận biết sự thay đổi ánh sáng – cụ thể là đêm dài.

4. The word “threshold” in the sentence “nights are shorter than this threshold” is closest in meaning to:
A. Maximum
B. Limit
C. Distance
D. Interval
✅ Answer: B
Giải thích: "Threshold" ở đây nghĩa là ngưỡng (giới hạn nhất định).

5. Which of the following best describes the function of phytochrome?
A. Enhancing root growth
B. Absorbing water
C. Sensing light changes that influence flowering
D. Protecting against pests
✅ Answer: C
Giải thích: Phytochrome là protein cảm nhận ánh sáng → ảnh hưởng đến việc ra hoa.

6–10. Listening Simulation (Text-based Academic Lecture)

Topic: The Concept of Opportunity Cost in Economics

Professor: “When economists talk about cost, they don’t just mean money. Opportunity cost refers to the value of the next-best alternative that is foregone when a decision is made. For instance, if you spend time watching TV instead of studying, the opportunity cost is the learning you missed. This concept helps individuals and societies make better resource allocation decisions.”

6. What is the main idea of the lecture?
A. How to manage a personal budget
B. The definition and significance of opportunity cost
C. How to measure economic profit
D. The history of television consumption
✅ Answer: B
Giải thích: Giảng viên giải thích khái niệm opportunity cost và ứng dụng thực tế.

7. According to the professor, opportunity cost involves:
A. Only financial loss
B. All the alternatives available
C. The value of the best alternative not chosen
D. Benefits from multiple decisions
✅ Answer: C
Giải thích: Opportunity cost là giá trị của lựa chọn tốt nhất bị từ bỏ.

8. Which example best illustrates opportunity cost?
A. Buying two items at a discount
B. Skipping a concert to work overtime
C. Saving money in a piggy bank
D. Listening to a podcast during a commute
✅ Answer: B
Giải thích: Bạn chọn làm thêm → bỏ lỡ concert → opportunity cost là niềm vui từ concert.

9. Why does the professor mention watching TV instead of studying?
A. To criticize television habits
B. To show opportunity cost in everyday life
C. To explain time management
D. To promote educational programs
✅ Answer: B
Giải thích: Đây là ví dụ giúp người học hiểu rõ opportunity cost qua tình huống đời thường.

10. What can be inferred about opportunity cost in decision-making?
A. It simplifies choices
B. It’s irrelevant in daily life
C. It helps weigh trade-offs more logically
D. It encourages impulsive decisions
✅ Answer: C
Giải thích: Biết opportunity cost giúp ta đưa ra quyết định tốt hơn bằng cách cân nhắc lợi ích bị từ bỏ.

11–15. Vocabulary & Grammar – Advanced

11. Choose the word closest in meaning to “inadvertently”:
A. Deliberately
B. Casually
C. Accidentally
D. Frequently
✅ Answer: C
Giải thích: “Inadvertently” = vô tình, không cố ý → accidentally.

12. Choose the grammatically correct sentence:
A. The data suggests that the trend are increasing.
B. The data suggest that the trend is increasing.
C. The datas suggest that the trend is increasing.
D. The data suggests that the trend is increasing.
✅ Answer: B
Giải thích: "Data" là danh từ số nhiều → suggest không thêm “s”, “trend” là số ít → dùng “is”.

13. What is the best word to complete the sentence?
“The scientist’s theory was initially met with ______, but later gained wide acceptance.”
A. acclaim
B. skepticism
C. reverence
D. indifference
✅ Answer: B
Giải thích: "Initially met with skepticism" = ban đầu bị nghi ngờ → phù hợp với ngữ cảnh.

14. Which sentence uses parallel structure correctly?
A. She likes to hike, biking, and swim.
B. She likes hiking, biking, and swimming.
C. She likes to hike, to biking, and to swim.
D. She likes hike, biking, and swim.
✅ Answer: B
Giải thích: Dùng cấu trúc song song đúng: hiking, biking, swimming (gerund – danh động từ).

15. What is the meaning of the phrase “a double-edged sword”?
A. A solution with no drawbacks
B. A situation with both positive and negative consequences
C. An ancient weapon
D. A strategy that always works
✅ Answer: B
Giải thích: "Double-edged sword" = con dao hai lưỡi → vừa có lợi vừa có hại.

16–20. Inference, Logic, and Paraphrasing

16. What can be inferred from the sentence?
“Though the study was small in scale, its implications were far-reaching.”
A. The study had no value
B. The study’s scope was too narrow
C. The results affected a larger field
D. The results were inconsistent
✅ Answer: C
Giải thích: “Far-reaching implications” = tác động rộng → kết quả ảnh hưởng lớn dù nghiên cứu nhỏ.

17. Which sentence shows contrast?
A. Because it was raining, we canceled the picnic.
B. Despite the rain, we went ahead with the picnic.
C. The picnic was fun and relaxing.
D. The picnic included many dishes.
✅ Answer: B
Giải thích: "Despite the rain" → đối lập giữa điều kiện thời tiết xấu và hành động vẫn diễn ra.

18. Paraphrase: “The policy sparked controversy among the academic community.”
A. The academic community quickly approved the policy.
B. The policy caused disagreement among scholars.
C. Academics ignored the new policy.
D. The policy had no impact.
✅ Answer: B
Giải thích: “Sparked controversy” = gây tranh cãi → gây ra sự bất đồng trong giới học thuật.

19. Logical conclusion: “Online learning platforms have seen unprecedented growth since 2020.”
A. Fewer students are using the internet
B. More people are turning to online education
C. Traditional classrooms have become obsolete
D. The internet became slower
✅ Answer: B
Giải thích: “Unprecedented growth” → nhiều người sử dụng nền tảng học online hơn.

20. What is implied by: “Without proper regulation, AI development could outpace ethical frameworks”?
A. AI is strictly controlled
B. AI poses no ethical problems
C. There is concern about AI advancing faster than ethics
D. Regulation has already solved AI issues
✅ Answer: C
Giải thích: Ý ngầm: nếu không kiểm soát, AI có thể vượt quá khả năng đạo đức hiện tại.

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