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.

Non-Toxic Treatment Targets Termites
Topic: American researchers have found a new method of killing termites. Transcript of radio broadcast. Source: VOA

Listen to the audio clip and fill in the blanks.

Termites are social insects that feed on material containing cellulose, including wood. By one estimate, termites cause $30 billion a year in damage to structures worldwide, plus more spent on pesticides to get of them.

Now, American researchers have on something that may lead to a method of killing termites in a potentially more benign way.

Our termite control arsenal now consists mainly of toxic chemicals - pesticides that can have damage, harming other animals, including humans.

"So the current techniques are to put some of these chemicals in barriers around households where they can into the groundwater."  Mark Bulmer studies termites and he writes about his latest research this week in the Proceedings of the National Academy of Sciences. He's now at Towson University, but his paper is based on work he did at Northeastern University in Boston, along with from MIT.

Studying the insects in the lab, Bulmer found termites have natural resistance to a that would otherwise be deadly to the bugs, but a kind of sugar can undermine that natural protection.

"What we basically found is they're producing these enzymes that are able to chew up a component of the fungal cell , and a small sugar called Glucono delta-lactone [GDL] could these enzymes. And that would prevent the enzymes from chewing up the fungal cell wall and, therefore, make the termite vulnerable to fungal ."

So instead of poisoning the termites with toxic chemicals, you could feed them this sugar. It's not the same sugar we use to our coffee or tea, but it is already used as a food additive, and it occurs naturally in other foods such as wine and , so it shouldn't hurt humans or other organisms.

So far this is just a laboratory finding, but in an interview, Bulmer suggested that the sugar and the fungus could be combined into a food that would attract termites and kill them before they could do damage.

"One idea is that you could actually design a bait for termites, a food source that termites would , and they would be exposed to, say, a fungal pathogen that you put in this bait, and you also include in the bait this sugar that basically prevents them from destroying the fungus with their system."

Again, Bulmer stressed that he hasn't confirmed this out in the real world.

"We haven't tested it in the field. We've just done this in the lab. And it works in the lab in that you can termites this sugar, and they become more vulnerable to the fungal pathogens. In the real world, it's a lot more , obviously, and we have not actually tested this in the ."

Mark Bulmer says his co-authors from MIT will be taking the next step, bringing this discovery out of the laboratory and trying to find the best way to use this discovery to actually control wood-eating termites and take a out of that estimated $30 billion in damage they cost each year.

Score:
   

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

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That's curious!
The word cardigan, meaning a knitted jacket fastened with buttons, was named after James Thomas Brudenell, 7th Earl of Cardigan. This piece of garment was first worn by British soldiers during the cold winter of Crimea, where the Earl led the Light Brigade in the Crimea War in 1854.

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