TOEFL Reading Inference: Cách suy luận mà không đoán mò

Bằng chứng A (Fact A) + Bằng chứng B (Fact B) ➔ Kết luận logic tất yếu (Inference)

Tuyệt đối không áp dụng: Chủ đề (Topic) + Định kiến cá nhân (Personal belief) ➔ Đáp án suy diễn

“The elevator in the central library is undergoing mechanical maintenance today. Visitors needing wheelchair assistance or moving heavy book carts should use the ground-level ramp at the Oak Street entrance.”

“Species X thrives exclusively in high-altitude environments where temperatures remain below freezing for most of the year. Over the past three decades, average winter temperatures in this mountain range have risen steadily.”

“Starting next month, the resident hall laundry rooms will no longer accept cash or physical laundry tokens. All washing machines and tumble dryers will operate exclusively via the campus digital payment card. Students whose cards have expired or have lost RFID functionality should visit the Student Housing Office before the end of this week to receive a replacement without charge.”

Question: What can be inferred about the resident hall laundry system?

A. Laundry prices will increase significantly starting next month.

B. Students without a functional digital payment card will be unable to use laundry machines next month.

C. Physical tokens were previously issued to students entirely free of charge.

D. The Student Housing Office will be closed permanently at the end of this week.

“Applications for the summer research fellowship at the Marine Institute are highly competitive, typically receiving over four hundred submissions for twenty positions. In past review cycles, candidates who completed advanced coursework in statistical modeling and submitted two faculty recommendations were three times more likely to advance to the interview stage than applicants with general coursework alone.”

Question: What does the advisory imply about the application process?

A. Every applicant with two faculty recommendations is guaranteed an interview.

B. Practical research experience is explicitly prohibited for first-year undergraduates.

C. Candidates with quantitative modeling skills possess a distinct competitive advantage in initial screening.

D. The Marine Institute will increase the number of fellowship positions to four hundred next year.

“Fossilized teeth of early hominins recovered from cave deposits in East Africa reveal microscopic wear patterns characterized by deep striations rather than shallow pits. In modern primates, such linear striations correlate almost exclusively with a diet composed of fibrous vegetation, tubers, and tough roots, whereas pit-heavy wear patterns reflect the consumption of hard-shelled nuts and seeds. Furthermore, isotope ratios of carbon-13 extracted from the enamel closely mirror the signatures found in savannah grasses.”

Question: What can be inferred about the diet of the early hominins described in the passage?

A. They consumed hard-shelled nuts as their primary source of daily caloric intake.

B. Their nutritional sustenance relied heavily on tough, fibrous savannah plants rather than hard seeds.

C. They were incapable of chewing any solid food items without stone grinding tools.

D. Modern primates have completely lost the ability to process fibrous roots.

“During the mid-twentieth century, atmospheric chlorofluorocarbons (CFCs) were hailed as inert, non-toxic miracle compounds ideal for refrigeration. However, upon drifting into the stratosphere, ultraviolet radiation cleaves chlorine atoms from CFC molecules. A single liberated chlorine radical can catalyze the breakdown of up to one hundred thousand ozone molecules through a regenerative catalytic cycle before being removed by natural deposition.”

Question: The author implies that CFCs:

A. Are completely harmless to the atmosphere regardless of altitude.

B. Pose a severe threat to ozone concentration disproportionate to their molecular volume.

C. Cannot be broken down by any natural phenomenon in the upper atmosphere.

D. Were intentionally designed by chemists to accelerate stratospheric degradation.

“Obsidian blades excavated from prehistoric trading settlements in Anatolia display chemical trace signatures originating from volcanic quarries located over six hundred kilometers away. Interestingly, the proportion of exotic obsidian artifacts increases dramatically within burial sites containing prestige grave goods, such as polished copper beads and carved ivory pendants, while mundane domestic quarters yield predominantly local chert tools.”

Question: Which of the following can be inferred regarding obsidian blades in this society?

A. They were used exclusively by farmers for daily agricultural harvesting.

B. They held significant social or symbolic value and were associated with elite status.

C. They were inferior in durability to blades made from local chert.

D. They were manufactured without any long-distance interregional trade.

“Certain species of desert succulents undergo Crassulacean Acid Metabolism (CAM), keeping their stomata tightly sealed during blistering daytime hours and opening them exclusively under nocturnal coolness to absorb carbon dioxide. Although this temporal separation dramatically minimizes transpiration water loss, CAM photosynthesis limits the total rate of carbon fixation compared to conventional C3 plants in temperate biomes with abundant rainfall.”

Question: What can be inferred about CAM plants?

A. They would likely grow at a slower rate than C3 plants if cultivated in well-watered temperate environments.

B. They open their stomata during the hottest midday hours to maximize water release.

C. They are completely unable to survive in arid desert climates.

D. They fix carbon dioxide at a rate ten times faster than any conventional temperate plant.

Câu 1 (Daily Life):

“Due to water main repairs on North Campus, the Central Dining Hall will offer only cold grab-and-go meal boxes today. Hot entree stations will remain closed until water pressure is fully restored. Students with meal plans requiring heated dietary accommodations may use their dining cards at West Hall without paying an additional transfer fee.”

What does the notice imply?

A. West Hall has not lost its water supply for cooking hot entrees.
B. All university dining facilities are shut down permanently.
C. Cold meal boxes contain unsafe drinking water.
D. Students must pay double at West Hall today.

Câu 2 (Daily Life):

“The campus bookstore has instituted a buyback policy where students receive up to fifty percent of original textbook costs if books are returned in pristine condition with all digital access codes unrevealed. Books with highlighted pages or cracked spines are eligible for a maximum refund of ten percent.”

It can be inferred that:

A. Textbooks with scratched digital access scratch-offs will receive less than fifty percent refund.
B. The bookstore will refuse to buy back any book that has been read.
C. Digital access codes cannot be used by modern university students.
D. Highlighted books are worth more than brand-new textbooks.

Câu 3 (Daily Life):

“The student parking garage on Elm Street is currently operating at maximum vehicle capacity due to the annual alumni conference. Commuter permit holders who arrive after 9:00 AM are advised to utilize the perimeter shuttle lot located off Highway 10, which connects to campus every twelve minutes.”

What is implied about commuters arriving at Elm Street garage after 9:00 AM?

A. They will receive an automatic parking violation fine.
B. They are unlikely to find an available parking stall in the Elm Street garage.
C. They are required to purchase an alumni pass immediately.
D. The shuttle bus to Highway 10 has been canceled.

Câu 4 (Daily Life):

“Sign-ups for the university intramural volleyball league close this Wednesday at midnight. Teams must consist of at least six registered students, with a maximum roster of ten. Incomplete rosters submitted before the deadline will be placed on a pending waitlist and matched with unaffiliated individual free agents.”

What can be inferred about an incomplete roster?

A. It is immediately disqualified without any possibility of playing.
B. It may be filled with players who signed up without an existing team.
C. It must pay double league registration fees.
D. It has more than ten players enrolled.

Câu 5 (Academic – Zoopharmacognosy):

“Chimpanzees observed in Western Tanzania periodically swallow whole, unchewed leaves of the Aspilia plant during the rainy season. Chemical analysis shows the leaves contain thiarubrine-A, a potent compound lethal to parasitic nematodes. Interestingly, chimps consume these bristly leaves almost exclusively when fecal parasite counts peak, despite the leaves offering zero measurable caloric nutrition.”

The passage implies that chimpanzees ingest Aspilia leaves primarily to:

A. Satisfy urgent daily caloric and carbohydrate requirements.
B. Self-medicate against intestinal parasite infestations.
C. Sharpen their canine teeth against coarse plant bristles.
D. Store food reserves during severe winter blizzards.

Câu 6 (Academic – History of Technology):

“Early Gutenberg printing presses utilized oil-based ink derived from linseed oil and soot, a significant departure from the water-based inks favored by scriptorium scribes. Water-based inks adhered poorly to metal alloy movable type, creating blurred impressions that smudged across porous rag paper. By increasing ink viscosity with boiled oil, early printers achieved sharp typographic clarity that made mass book production viable.”

What can be inferred about water-based inks in early movable-type printing?

A. They were excessively expensive compared to linseed oil inks.
B. They caused technical impediments that hindered legible print reproduction on metal type.
C. They were completely outlawed by medieval religious authorities.
D. They produced more permanent impressions than oil-based inks.

Câu 7 (Academic – Glaciology):

“Subglacial meltwater channels lubricate the interface between glacial ice sheets and bedrock, facilitating faster ice flow toward ocean margins. Satellite telemetry reveals that ice velocity increases dramatically within hours of intense summer surface melting events, suggesting that surface meltwater drains rapidly through vertical crevasses (moulins) rather than percolating slowly through porous firn layers.”

The author implies that moulins:

A. Prevent surface meltwater from reaching the glacial bedrock interface.
B. Provide direct conduits that accelerate water drainage to the base of ice sheets.
C. Only form during subzero winter temperature drops.
D. Permanently halt the movement of glacial ice toward oceans.

Câu 8 (Academic – Marine Biology):

“Deep-sea hydrothermal vent communities exist in total aphotic darkness, independent of solar photosynthetic energy. Instead, specialized chemosynthetic bacteria oxidize toxic hydrogen sulfide surging from volcanic fissures, converting chemical energy into organic biomass. In experimental chambers where hydrogen sulfide concentrations were artificially neutralized, primary biomass production among vent fauna plummeted by over ninety percent.”

What can be inferred about hydrothermal vent ecosystems?

A. Sunlight penetration is essential for the survival of vent fauna.
B. Chemosynthetic bacteria form the foundational primary trophic level of the community.
C. Toxic sulfur compounds cause rapid mortality in chemosynthetic bacteria.
D. Deep-sea vents produce more solar energy than tropical coral reefs.

Câu 9 (Academic – Cognitive Neuroscience):

“Individuals afflicted with prosopagnosia exhibit severe impairments in recognizing familiar faces, including their own reflection, despite demonstrating normal visual acuity and flawless ability to identify everyday inanimate objects like chairs and clocks. Neuroimaging reveals that while the primary visual cortex remains intact, metabolic activity in the fusiform face area (FFA) of the right temporal lobe is markedly suppressed.”

It can be inferred from the passage that:

A. Facial recognition relies on specialized neural circuitry distinct from general object identification.
B. Prosopagnosia is caused by a complete loss of primary visual cortex photoreceptors.
C. Patients with prosopagnosia are incapable of navigating physical environments safely.
D. Everyday inanimate objects are recognized exclusively through the fusiform face area.

Câu 10 (Academic – Soil Ecology):

“Mycorrhizal fungal networks interconnect the root architectures of mature canopy trees with surrounding understory saplings. Isotope tracing demonstrates that shaded saplings receiving zero direct sunlight absorb radioactive carbon carbohydrates transferred directly from sun-drenched canopy crowns via hyphal pathways. When fungicides severed these subterranean fungal connections, shaded sapling mortality rates escalated threefold.”

The author implies that mycorrhizal networks:

A. Drain essential carbohydrates away from vulnerable saplings to feed mature trees.
B. Subsidize the survival of light-deprived understory saplings through inter-plant resource sharing.
C. Replace all normal photosynthesis in mature canopy crowns.
D. Kill mature trees by escalating fungal parasite populations during summer.

TOEFL Reading Inference là gì?

Inference trong TOEFL Reading là câu hỏi yêu cầu thí sinh rút ra một kết luận tất yếu hoặc thông tin ẩn ý dựa trên các dữ kiện thực tế mà bài đọc cung cấp, chứ không phải đoán mò hay suy diễn theo sở thích cá nhân.

Inference có phải là đoán mò (guessing) không?

Hoàn toàn không. Khảo thí chuẩn hóa ETS không chấm điểm sự tưởng tượng. Mọi câu suy luận đúng đều là kết quả của một phép suy luận logic chặt chẽ (deduction) từ các tiền đề có sẵn trong văn bản.

Có được sử dụng kiến thức bên ngoài bài đọc không?

Tuyệt đối không. Kể cả bạn là chuyên gia trong lĩnh vực được thảo luận, nếu thông tin không xuất hiện hoặc không suy ra được từ dữ kiện của bài đọc, việc đưa kiến thức ngoài vào sẽ khiến bạn sập bẫy nhiễu.

Làm sao để tìm được evidence cho câu suy luận?

Hãy bám vào từ khóa chỉ đối tượng trong câu hỏi, tìm đúng câu chứa đối tượng đó trong bài, đọc thêm 1 câu liền trước và 1 câu liền sau để xác định trọn vẹn quan hệ nhân quả hoặc điều kiện.

Các từ always, never có luôn luôn sai không?

Không luôn luôn sai, nhưng rất hiếm khi đúng. Chỉ chọn phương án chứa từ ngữ tuyệt đối khi bài đọc sử dụng các cụm từ khẳng định 100% không có ngoại lệ tương đương.

Implied meaning khác Detail thế nào?

Detail là thông tin được tác giả viết rõ ràng bằng chữ trong bài. Implied meaning là thông điệp tác giả ngầm hiểu người đọc sẽ tự suy ra được từ chi tiết đó.