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.

Why Getting Dirty Can Be Healthy for Children
Topic: Transcript of radio broadcast. Source: VOA

Escucha el audio y completa los recuadros.

This is the VOA Special English Health Report.

A new study suggests that early exposure to germs the immune system. That means letting children get a little dirty might be good for their health later in life.

The study involved laboratory mice. It found that adult mice raised in a germ-free environment were more likely to develop , asthma and other autoimmune disorders. There are more than eighty disorders where cells that normally defend the body instead attack tissues and .

They include rheumatoid arthritis, which attacks the joints; Crohn's disease, an inflammatory bowel condition; and juvenile diabetes. Hay fever, a common allergy, is also an autoimmune .

Richard Blumberg is a professor at Harvard Medical School in Boston, Massachusetts. He says in nineteen eighty-nine, medical researchers sought to explain these diseases with what they called the "hygiene hypothesis." They proposed that the increasing use of soaps and other products, especially early in life, could weaken immune systems.

RICHARD BLUMBERG: "The hypothesis has stated or suggested that early-life exposure to is a very important determinant of later life sensitivity to allergic and so-called autoimmune diseases, such as fever, asthma, inflammatory bowel disease and others."

Now, Dr. Blumberg and a team have what they say is the first biological evidence to link early exposure to germs to stronger adult immune systems. They say this exposure could the development of some autoimmune diseases.

In the adult germ-free mice, they found that inflammation in the lungs and colon was caused by so-called killer T cells. These normally fight . But they became overactive and targeted healthy tissue -- an autoimmune condition seen in asthma and a disease called ulcerative colitis.

Dr. Blumberg says the mice raised in a normal environment did not have the same . He says their immune systems had been "educated" by early exposure to germs.

RICHARD BLUMBERG: "What was really most remarkable to us was the fact that once the education event provided by the microbes occurred in early life, it was and lasted throughout the life of the animal."

Rates of autoimmune disorders are rising worldwide, but mostly in , industrialized countries.

RICHARD BLUMBERG: "I think one obvious question, for example, that's raised by these studies is the early life use of antibiotics and whether we need to be more careful in their ."

Rob Dunn is a professor of ecology and evolutionary biology at North Carolina State University in Raleigh. He says the new study does not mean people should stop washing.

ROB DUNN: "Wash your hands, but don't do it with antimicrobial soap. Let your kids play in a reasonable amount of and get outside and get exposed to a diversity of things."

The study appears in the journal Science.

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

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