托福考试

【单选题】In the 1930s, the Great Plains of NorthAmerica came to be called theDustBowl after several large dust storms destroyed the region. TheDustBowl was the result of human activity and bad weather that led to soil erosion. In the previous decade, farmers had plowed millions of acres of grassland to make room for growing wheat.Consequently, when a period of dry weather struck the region, there were no native grasses to hold the soil in place. The wind lifted the dry soil and carried it away in great clouds. TheDustBowl was an ecological and economic disaster, resulting in severe soil loss, crop failures, and economic hardship.

A、Cold weather

B、Soil erosion

C、Loss of native grasses
D．Lack of rain

网考网参考答案：A
网考网解析：
Cold weather is not given as a cause of the Dust Bowl. All the other answers are given: The Dust Bowl was the result of human activity and bad weather that led to soil erosion; ...farmers had plowed millions of acres of grassland...; ... when a period of dry weather struck the region, there were no native grasses to hold the soil in place. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>