B．They earned little money by selling wheat.

　　C．Their land was too wet to plant wheat.

　　D．Their land was used to build railroads.

　　解析：选B。细节理解题。由倒数第二段中的“During World War I，there was good rain and wheat prices were high.But after the war，prices dropped.”可知，一战之后，小麦价格下跌导致了一些人放弃了土地。

　　4．How do Paragraphs 5 and 6 mainly develop?

　　A．By using numbers.

　　B．By giving examples.

　　高中学习网 www.gkxx.comC．By providing causes.

　　D．By making comparisons.

　　解析：选C。写作手法题。第五和第六段主要是分析了引发1935年沙尘暴的原因，第五段第一句即这两段的主题句。

　　B

　　(2016·甘肃天水市秦安县高三模拟)Besides containing attractive flowers，trees and other plants that beautify the community，eco­friendly rain gardens are healthy for the environment and the people living and working nearby.

　　A rain garden is not very different from a traditional garden.It is just a far more eco­friendly garden.Usually it is built lower than the ground.Rain gardens make smart use of rain and storm water by temporarily holding water from rain and storms and letting it soak (浸入)slowly into the ground before it runs into streams or enters the public drinking water supply.

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