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Formato actual/Read an Academic Passage

TOEFL Reading · Formato actual

Read an Academic Passage: practica lectura universitaria con evidencia

Esta tarea entrena lectura academica: idea principal, inferencia, proposito retorico y regreso al texto para justificar cada respuesta.

Respuesta directa: primero identifica la tesis del pasaje, luego separa evidencia textual de inferencias razonables. Si una opcion usa palabras del texto pero cambia la relacion logica, no es correcta.

Formato oficial vs estrategia WeLearn

Formato oficial: ETS lista Read an Academic Passage como una de las familias actuales de TOEFL Reading.

Estrategia WeLearn: practicamos pasajes cortos con preguntas explicadas antes de pasar a lecturas largas y control de tiempo.

Fuente oficial revisada: ETS TOEFL iBT Test Content and Structure.

Set 1 · Práctica interactiva

Pasaje académico · 5 preguntas

Práctica fija WeLearn. Reproduce familias de lectura y corrección local; no es adaptativa ni genera una puntuación oficial de ETS.

Después de las 5 preguntas del piloto verás una selección múltiple complementaria de WeLearn. Su resultado se informa por separado.

short expository passage

The Green Sahara

Read the passage and choose one answer for questions 1–5.

The Sahara is often imagined as a timeless sea of sand, but geological and archaeological evidence shows that it has repeatedly shifted between dry desert and greener landscapes. Scientists call the wetter phases African Humid Periods. During these periods, lakes, rivers, and grasslands spread across parts of North Africa. Rock art shows people herding cattle and animals such as giraffes and hippos. Fish and crocodile remains found beneath today's desert also point to a much wetter environment. These changes are linked to slow variations in Earth's orbit and axial tilt. Over tens of thousands of years, those variations alter the strength of summer sunlight in the Northern Hemisphere. Stronger summer heating can intensify the African monsoon and carry more rain northward; when the pattern shifts, rainfall retreats. The most recent humid period ended roughly five thousand years ago. The change also affected people. As lakes and grasslands disappeared, some communities moved toward areas with more dependable water, including the Nile Valley. Researchers continue to debate exactly how climate influenced later societies, but the Sahara's history demonstrates that landscapes that appear permanent can change substantially over long timescales.
What is the main idea of the passage?

Choose one answer.

Which evidence supports the existence of a wetter Sahara?

Choose one answer.

The word "intensify" in paragraph 3 is closest in meaning to

Choose one answer.

What can be inferred when the monsoon carries less rain northward?

Choose one answer.

Why does the author discuss human movement in the final paragraph?

Choose one answer.

Práctica complementaria WeLearn · fuera de las 5 preguntas del piloto oficial

Select the TWO statements supported by the passage.

Choose exactly 2 answers. Full credit requires the exact set.

Selected 0 of 2.

Respondidas: 0 de 6

Pasaje original

Banco inicial de pasajes académicos

Wetlands and coastal protection

Wetlands are often described as natural buffers because they slow the movement of water between land and sea. During storms, marsh plants and shallow pools absorb part of the wave energy that would otherwise strike roads, farms, or neighborhoods directly. This protection is not absolute, but it can reduce damage when wetlands remain wide enough and healthy enough to function as a living barrier.

For many years, some coastal communities drained wetlands to create space for buildings or agriculture. The short-term benefit was clear: more usable land. Over time, however, those communities sometimes discovered that the removed wetlands had been providing a service that was expensive to replace. Artificial walls can protect a narrow area, but they may also redirect water pressure to nearby places.

Researchers now argue that coastal planning should combine engineered structures with restored wetlands. This mixed approach recognizes that natural systems and human-made defenses can support each other. A restored marsh may not stop every flood, but it can lower the force that reaches a wall, making the wall more effective and less costly to maintain.

Seed banks and genetic diversity

Seed banks store seeds from many plant varieties in carefully controlled conditions. Their purpose is not simply to preserve rare plants as museum objects. By keeping genetic material available, seed banks give researchers and farmers a way to respond when disease, drought, or changing climate conditions threaten existing crops.

Genetic diversity matters because plants of the same crop can differ in useful traits. One variety of rice may tolerate flooding, while another may resist a particular insect. If agriculture depends on only a narrow set of varieties, a single disease can cause widespread damage. A broader genetic collection increases the chance that at least some plants will survive a new threat.

However, storing seeds is only part of the work. Seeds must be tested, replaced, and documented so that scientists know which traits they carry. Without accurate records, a seed bank may contain valuable material that cannot be used efficiently. For this reason, modern seed banks combine biological preservation with detailed information management.

Urban heat and reflective surfaces

Cities are often warmer than nearby rural areas because dark roofs, roads, and walls absorb sunlight during the day and release heat slowly after sunset. This pattern, known as the urban heat effect, can increase energy use when residents depend more heavily on air conditioning. It can also make outdoor spaces uncomfortable for pedestrians during periods of extreme heat.

One proposed response is to use reflective materials on roofs and pavements. These surfaces send more sunlight back into the atmosphere instead of storing it as heat. In several pilot projects, reflective roofs have lowered indoor temperatures and reduced cooling costs. However, the benefits depend on local design. A surface that reflects light into nearby windows, for example, may create glare or raise temperatures inside adjacent buildings.

For this reason, urban planners increasingly treat reflective materials as one tool rather than a complete solution. Trees, shade structures, ventilation corridors, and lighter surfaces can work together when they are placed according to how people actually move through the city. The strongest plans are not the ones that use a single technology everywhere, but the ones that match heat-reduction strategies to local streets, buildings, and daily routines.

Práctica guiada

Responde con evidencia

Wetlands and coastal protection · Ítem 1 · Main idea

What is the main idea of the passage?

  1. Wetlands can help protect coastal areas and should be included in planning.
  2. Artificial walls are always more effective than natural barriers.
  3. Coastal communities should avoid all construction near water.
  4. Researchers disagree about whether wetlands absorb wave energy.

Wetlands and coastal protection · Ítem 2 · Inference

What can be inferred about communities that drained wetlands?

  1. They may have underestimated a service the wetlands were already providing.
  2. They were unable to build artificial walls after draining land.
  3. They drained wetlands mainly to improve water quality.
  4. They knew the long-term costs before making the change.

Wetlands and coastal protection · Ítem 3 · Rhetorical purpose

Why does the author mention artificial walls in the second and third paragraphs?

  1. To compare a human-made defense with the protective role of wetlands.
  2. To argue that walls should be removed from all coastal areas.
  3. To show that walls are useful only for agriculture.
  4. To introduce an unrelated example of urban design.

Seed banks and genetic diversity · Ítem 1 · Factual information

According to the passage, why is genetic diversity useful for crops?

  1. It increases the chance that some plants can survive new threats.
  2. It allows farmers to stop documenting plant traits.
  3. It guarantees that every crop will grow faster.
  4. It removes the need to store seeds in controlled conditions.

Seed banks and genetic diversity · Ítem 2 · Vocabulary in context

In the first paragraph, the word "threaten" is closest in meaning to:

  1. endanger
  2. describe
  3. measure
  4. organize

Seed banks and genetic diversity · Ítem 3 · Rhetorical purpose

Why does the author mention rice varieties in the second paragraph?

  1. To give an example of how varieties within one crop can have different useful traits.
  2. To argue that rice is the only crop stored in seed banks.
  3. To show that flooding is more dangerous than insects.
  4. To explain why controlled storage damages seeds.

Urban heat and reflective surfaces · Ítem 1 · Factual information

According to the passage, why can cities stay warm after sunset?

  1. Dark surfaces release stored heat slowly.
  2. Rural areas send heat into cities at night.
  3. Reflective roofs prevent all nighttime cooling.
  4. Pedestrians produce enough heat to warm streets.

Urban heat and reflective surfaces · Ítem 2 · Rhetorical purpose

Why does the author mention glare from reflective surfaces?

  1. To show that reflective materials can create problems if they are not planned carefully.
  2. To prove that reflective roofs should never be used in cities.
  3. To explain why dark surfaces are safer for pedestrians.
  4. To introduce a new argument about rural building design.

Urban heat and reflective surfaces · Ítem 3 · Inference

What can be inferred about effective heat-reduction plans?

  1. They should combine strategies based on local conditions.
  2. They should use reflective materials on every surface.
  3. They should focus only on indoor cooling costs.
  4. They should avoid trees because shade blocks ventilation.

Respuestas explicadas

Clave del pasaje academico

Wetlands and coastal protection · Ítem 1: A

All three paragraphs build toward the idea that wetlands provide protection and work best when included in coastal planning.

Trampa: Option B is too absolute and contradicts the final paragraph. Option D invents disagreement that the passage does not mention.

Wetlands and coastal protection · Ítem 2: A

The second paragraph says the short-term benefit was clear, but communities later discovered the wetlands had been providing an expensive-to-replace service.

Trampa: The passage does not say they could not build walls, and it does not present water quality as the reason for draining.

Wetlands and coastal protection · Ítem 3: A

The wall example helps explain why a combined strategy can be stronger than relying on only one type of defense.

Trampa: TOEFL often uses extreme distractors. The passage supports mixed planning, not removing all walls.

Seed banks and genetic diversity · Ítem 1: A

The second paragraph says a broader genetic collection improves the chance that some plants survive disease or environmental threats.

Trampa: The passage supports careful documentation and controlled storage; it does not remove those needs.

Seed banks and genetic diversity · Ítem 2: A

Disease, drought, and climate conditions can endanger crops. That is the meaning of threaten in this context.

Trampa: Measure and organize may appear in scientific contexts, but they do not fit the risk relationship in the sentence.

Seed banks and genetic diversity · Ítem 3: A

The rice example illustrates the broader point that diversity inside one crop can provide different survival advantages.

Trampa: The passage does not compare flooding and insects by severity, and it does not limit seed banks to rice.

Urban heat and reflective surfaces · Ítem 1: A

The first paragraph says dark roofs, roads, and walls absorb sunlight during the day and release heat slowly after sunset.

Trampa: The passage compares cities with rural areas, but it does not say rural areas transfer heat into cities.

Urban heat and reflective surfaces · Ítem 2: A

The glare example qualifies the benefit of reflective materials and supports the idea that local design matters.

Trampa: The author does not reject reflective roofs; the final paragraph treats them as one useful tool among several.

Urban heat and reflective surfaces · Ítem 3: A

The final paragraph says the strongest plans match several strategies to local streets, buildings, and daily routines.

Trampa: Option B is too absolute. The passage warns against using one technology everywhere.

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