Recursos para estudiantes de inglés de todos los niveles, profesores y traductores. Para aprender o mejorar tu inglés en forma divertida.
Listening Comprehension - Comprensión Auditiva

Cómo realizar este ejercicio de comprensión auditiva

- Siempre encontrarás una pequeña introducción, que puede ayudarte a comprender el tema tratado.

- En los textos presentados se han ocultado algunas palabras, que deberás escribir en los casilleros correspondientes. A medida que lees el texto, escucha el audio con atención para descubrir dichas palabras.

- Quizás puedes deducir las palabras sin necesidad de escuchar el audio. Pero, pon atención al audio para confirmar si realmente se trata de la respuesta correcta.

- Puedes escuchar el audio cuantas veces sea necesario. Pero es recomendable hacerlo solamente dos veces (o tres veces como máximo) ya que esa es la forma en que normalmente se realizan estos ejercicios en exámenes y pruebas internacionales.

- Comprueba tus aciertos pulsando el botón "Corregir". Si no has podido completar todas las palabras, pulsa el botón "Solución" para ver cuáles eran las que te faltaban.

Looking for Energy in Algae
Topic: A Seattle company harvests wild algal blooms in search of natural gas and biochemicals. Transcript of radio broadcast. Source: VOA

Escucha el audio y completa los recuadros.

This is the VOA Special English Agriculture Report.

The search for new fuels has led some researchers to . Algae is a name for thousands of different organisms. They include single-celled plants as well as and other large plants.

Kenneth Bruland is an ocean sciences professor at the University of California, Santa Cruz. He says many experts also consider plant-like to be a form of algae. These bacteria make food from the sun like plants do. Algae grow and some contain a lot of oils. Most algae-to-energy researchers are growing algae in tanks. But one company, Blue Marble Energy in Seattle, Washington, uses algae already growing along . Workers pump it into bags on a boat. They have to be careful not to suck up young fish or other small creatures.

Blue Marble says its work could help prevent harmful algae blooms. A bloom is when a dense area of algae forms and . Some blooms can harm people, animals or the environment.

Warmer water can cause blooms, and some scientists think global warming is adding to an increase in large ones. Nutrients from and agricultural fertilizers also help algae grow.

Blue Marble is a start-up company with private investors. It also has a contract with Washington state to collect the algae called ulva, or sea , in parts of Seattle's Puget Sound waterway. In Puget Sound, big blooms of sea lettuce often break down in Dumas Bay. This process of uses up oxygen and kills marine life. And when the sea lettuce washes up on the beach, it smells terrible.

Blue Marble President Kelly Ogilvie says his company has collected almost four thousand kilos of algae in two . The next step is to use bacteria to break down the algae into natural gas and different chemicals. Most companies doing algae-to-energy research are creating liquid for cars or airplanes.

But some people have concerns about harvesting algae. University of Washington researcher Kevin Britton-Simmons says removing the algae does not solve the problem. He says keeping fertilizer and other pollutants out of the water would a lot of unnatural blooms.

He also says it is difficult to tell the difference between natural algae blooms and those caused by human activity. He says removing natural blooms would remove valuable food for life.

And that's the VOA Special English AGRICULTURE Report. I'm Steve Ember.

Score:
   

Más ejercicios similares: Nivel Principiantes - Nivel Intermedio - Nivel Avanzado

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