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.

Growing Crops With Less Water
Topic: Researchers are developing plants that use less water or use it better, or both. Transcript of radio broadcast. Source: VOA

Escucha el audio y completa los recuadros.

This is the VOA Special English Agriculture Report.

Scientists are working to crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world's freshwater withdrawals from rivers, lakes and other water resources go toward fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas "Tommy" Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional methods to develop soybeans that can grow well under dry conditions.Tommy Carter started working on drought-resistant soybeans in nineteen eighty-one. His research has taken him as far as China, where soybeans have been grown for thousands of years.

Farmers in the United States, however, have grown soybeans for only about a . Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences, or diversification, could better protect crops against climate changes that can reduce production. Those changes include water which could increase from global warming.

The Agriculture Department has a soybean germplasm collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than two thousand five hundred examples from the collection.

They looked at ones from the ancestral home of soybeans, Asia. They searched for germplasms that could keep plants from and wilting during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight more than normal soybeans under drought conditions. The yield depends on location and environment.

The team is now doing tests. The first breeding line is expected to be released next year for use by private seed companies and public soybean .

Scientists are also working on other plants that either use less water or use it , or both. For example, companies like Monsanto, DuPont and Syngenta are developing corn with reduced water needs. Monsanto expects to be ready in four years to market its first seeds genetically engineered to resist drought.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. I'm Doug Johnson.

Score:
   

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

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