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1. For make adobe bricks, workers mix sand and clay or mud with water and small quantities of straw,grass,of a similar material.(1)____
译文：为了做土砖，工人们用水将沙子、粘土／泥浆与少量的茎、草或类似物质混合起来。
2. Among almost seven hundred species of bamboo, some are fully grown at less than afoot high, while other can grow three feet in twenty-four hours.(2)____
译文：将近700种竹子中，一些完全长大的竹子不过一英尺高；而另一些竹子却能在24小时内长到3英尺。
3. Recent studies have shown that air into a house of ten has higher concentrations of contaminants than heavily polluted air outside.(3)____
译文：最近的研究表明：与室外严重污染的空气相比，室内的空气通常污染物浓度更高。
4. Langston Hughes, a prolific writer of the 1920's was concerned with the depicting the experience of urban Black people in the United States.(4)____
译文：朗斯通·休斯是20世纪20年代一位多产的作家，他的作品描绘了美国城市黑人的经历。
