VSTEP Reading Inference: Cách Làm Câu Hỏi Suy Luận Từ Bằng Chứng Trong Bài Đọc

Ví dụ 1:
Passage: “Excavations at the ancient settlement uncovered bronze harvesting sickles alongside extensive granary foundations, but no weapons of warfare were present in the residential strata.”
It can be inferred from the passage that the inhabitants:
(A) were frequently attacked by neighboring nomadic tribes.
(B) engaged primarily in peaceful agricultural activities.
(C) lacked the metallurgical skills to manufacture bronze tools.
(D) imported all their food supplies from distant trading ports.
→ Đáp án: (B). Bằng chứng: có liềm gặt (harvesting sickles) và kho thóc (granary), nhưng không có vũ khí chiến tranh (no weapons of warfare). Suy ra cư dân sinh sống chủ yếu bằng nông nghiệp hòa bình.

Ví dụ 2:
Passage: “The pharmaceutical company halted clinical trials for Compound X after forty percent of patients experienced severe liver enzyme irregularities, despite promising efficacy in early cell cultures.”
What does the passage imply about Compound X?
(A) It was immediately approved for commercial pharmacy distribution.
(B) Its potential health risks outweighed its therapeutic benefits.
(C) It was completely ineffective at treating cellular infections.
(D) Patients refused to take the medicine due to bitter taste.
→ Đáp án: (B). Thử nghiệm bị dừng do men gan bất thường nghiêm trọng ở 40% bệnh nhân, ngụ ý rủi ro sức khỏe lớn hơn lợi ích điều trị.

Ví dụ 3:
Passage: “Unlike other seabirds that nest on accessible sandy shores, the petrel constructs burrows exclusively on sheer cliff crevices facing turbulent ocean currents.”
It can be inferred that petrels choose cliff crevices to:
(A) protect their eggs from land-based predators.
(B) stay warm during freezing sub-zero winter storms.
(C) learn how to swim before developing adult feathers.
(D) socialize with large colonies of different avian species.
→ Đáp án: (A). Vách đá cheo leo (sheer cliff) đối lập với bãi cát dễ tiếp cận (accessible shores), là bằng chứng ngụ ý nhằm tránh các loài săn mồi trên cạn.

Ví dụ 4:
Passage: “When the central bank unexpectedly raised benchmark interest rates by two percentage points, domestic mortgage applications fell to their lowest level in fifteen years.”
What can be concluded about home buyers?
(A) They prefer renting homes indefinitely rather than purchasing properties.
(B) Higher borrowing costs discouraged many prospective buyers from taking loans.
(C) All commercial banks refused to process new home applications.
(D) Housing construction completely ceased throughout the country.
→ Đáp án: (B). Lãi suất tăng → số lượng đơn vay mua nhà giảm chạm đáy 15 năm → chi phí vay cao khiến người mua nhà chùn bước.

Ví dụ 5:
Passage: “Satellite telemetry recorded surface temperatures on the polar ice shelf hovering consistently between zero and two degrees Celsius above historical averages throughout July and August.”
It can be inferred that during those months, the ice shelf:
(A) experienced accelerated melting rates.
(B) doubled in total geometric thickness.
(C) was unaffected by regional climate trends.
(D) generated massive sub-surface glaciers.
→ Đáp án: (A). Nhiệt độ cao hơn trung bình lịch sử từ 0 đến 2 độ C suốt 2 tháng mùa hè ngụ ý tốc độ băng tan diễn ra nhanh hơn bình thường.

1. “Although the remote village received electrical grid connectivity in 2021, over seventy percent of households continue to utilize firewood stoves for daily evening cooking.”
It can be inferred that:
(A) Electric stoves were distributed freely to all villagers.
(B) Traditional cooking habits or economic factors persisted despite modernization.
(C) The village electrical grid suffered permanent structural damage.
(D) Firewood has become completely unavailable in the region.
Đáp án & Bằng chứng: (B). Dù có điện lưới từ 2021 nhưng hơn 70% hộ vẫn dùng bếp củi, ngụ ý thói quen truyền thống hoặc lý do kinh tế vẫn tồn tại.

2. “Studies show that honeybees perform intricate ‘waggle dances’ solely when returning from nectar sources located more than one hundred meters away from the hive.”
What can be inferred about nectar found 30 meters from the hive?
(A) Bees ignore it completely.
(B) It does not trigger the waggle dance behavior.
(C) It is toxic to larval bees.
(D) Bees transport it exclusively by flight formation.
Đáp án & Bằng chứng: (B). Ong chỉ nhảy điệu waggle khi nguồn hoa xa trên 100 mét, nên nguồn hoa ở 30 mét sẽ không kích hoạt điệu nhảy này.

3. “Prior to the introduction of containerized maritime shipping in the late 1950s, cargo vessels spent up to two weeks docked in port for manual loading and unloading.”
It can be concluded that containerization:
(A) significantly reduced the duration cargo ships spent at ports.
(B) increased the need for manual dock laborers.
(C) made international maritime trade unprofitable.
(D) was immediately banned by port authorities.
Đáp án & Bằng chứng: (A). Trước khi có container, tàu mất tới 2 tuần bốc dỡ thủ công, ngụ ý container hóa giúp rút ngắn đáng kể thời gian neo đậu cảng.

4. “Archaeologists found that the obsidian tools discovered at the inland mountain campsite originated from volcanic deposits over four hundred kilometers away.”
The presence of these tools implies that the prehistoric campers:
(A) lived in isolation without contact with other groups.
(B) engaged in long-distance travel or trade networks.
(C) were unable to work with locally available stone types.
(D) possessed modern transport machinery.
Đáp án & Bằng chứng: (B). Công cụ đá vỏ chai cách mỏ núi lửa hơn 400 km ngụ ý nhóm người tiền sử này đã di chuyển đường dài hoặc có mạng lưới trao đổi buôn bán.

5. “While the company’s revenue surged by twenty-five percent, net profits dropped noticeably due to substantial investments in artificial intelligence infrastructure.”
What does the passage imply about the company’s financial status?
(A) The company is on the verge of total bankruptcy.
(B) Spending on new technology temporarily suppressed profitability.
(C) Customer demand for services declined sharply.
(D) Artificial intelligence investments yielded instant cash profits.
Đáp án & Bằng chứng: (B). Doanh thu tăng 25% nhưng lợi nhuận ròng giảm do chi đầu tư hạ tầng AI, ngụ ý chi phí công nghệ tạm thời kéo giảm lợi nhuận.

6. “Cacti species native to the Atacama Desert survive almost exclusively on moisture absorbed from coastal morning fogs rather than infrequent rainfall.”
It can be inferred that an extended absence of coastal fogs would:
(A) improve cacti growth rates significantly.
(B) threaten the survival of native cacti populations.
(C) cause frequent torrential thunderstorms.
(D) have no measurable impact on desert vegetation.
Đáp án & Bằng chứng: (B). Xương rồng sống gần như dựa hoàn toàn vào sương mù ven biển, nên sự biến mất kéo dài của sương mù sẽ đe dọa sự sinh tồn của chúng.

7. “The playwright published three satirical comedies anonymously before finally attaching her real name to a serious historical drama.”
It can be inferred that the playwright:
(A) was initially cautious about public reaction to her satirical works.
(B) never wanted anyone to know her true identity.
(C) preferred historical dramas over comedic writing.
(D) was forbidden by law from writing comedies.
Đáp án & Bằng chứng: (A). Việc xuất bản ẩn danh 3 vở hài kịch châm biếm trước khi công khai danh tính ở vở kịch lịch sử cho thấy sự thận trọng ban đầu.

8. “Laboratory mice fed diets rich in refined sugars exhibited impaired spatial memory and heightened anxiety within just three weeks.”
The author implies that excessive refined sugar intake:
(A) exerts detrimental effects on neurological functions.
(B) cures anxiety symptoms in mammalian subjects.
(C) has identical consequences regardless of diet duration.
(D) improves spatial navigation in maze experiments.
Đáp án & Bằng chứng: (A). Chuột bị suy giảm trí nhớ không gian và tăng lo âu, ngụ ý đường tinh luyện gây tác động tiêu cực tới chức năng thần kinh.

9. “Following the nationwide implementation of mandatory bicycle helmet laws, head injury hospitalizations among cyclists dropped by thirty-eight percent.”
What does the data suggest about helmets?
(A) They eliminate all cycling accidents entirely.
(B) They provide meaningful protection against traumatic head injuries.
(C) They make bicycles heavier and harder to steer.
(D) Cyclists stopped riding bicycles after the law was passed.
Đáp án & Bằng chứng: (B). Tỷ lệ nhập viện do chấn thương đầu giảm 38% chứng tỏ mũ bảo hiểm mang lại sự bảo vệ có ý nghĩa.

10. “Although the novelist’s first manuscript was rejected by twelve major publishers, it became an international bestseller within six months of independent publication.”
It can be concluded that the initial publishers:
(A) correctly evaluated the commercial appeal of the book.
(B) misjudged the potential market success of the manuscript.
(C) collaborated to purchase the foreign publishing rights.
(D) encouraged independent self-publishing platforms.
Đáp án & Bằng chứng: (B). Mười hai nhà xuất bản từ chối bản thảo nhưng cuốn sách sau đó trở thành bestseller quốc tế, chứng tỏ các nhà xuất bản ban đầu đã đánh giá sai tiềm năng.