STEP Eiken English Proficiency Test

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Listen to the explanation of a historical event, then answer the question. (Narrator): 'The 'Dust Bowl' of the 1930s was one of America's worst environmental disasters. For years, farmers in the Great Plains had been plowing up millions of acres of native grassland to plant wheat. This traditional grass had deep roots that held the soil in place. When a severe drought hit the region, the over-plowed soil, which no longer had the grass to protect it, turned to dust. Powerful winds then swept across the plains, picking up the loose topsoil and creating massive, black dust storms that buried homes and destroyed farms.' According to the narration, what was the primary cause of the soil turning to dust?

The introduction of new types of crops. A sudden and unexpected increase in wind speeds. The failure of farmers to use modern irrigation techniques. A combination of severe drought and the removal of native grasses.

Correct Answer:

A combination of severe drought and the removal of native grasses.

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