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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

China has developed a technology that is able to transform desert lands into available soil. The technology1.(develop) several years ago by researchers at Chongqing Jiaotong University, They invented a paste (黏合剂)2.(make) of a material found in plant cell walls that, when mixed3.sand, is able to keep water, nutrients and air.

According to CGTN (中国国际电视台), Chinese scientists have achieved success in growing crops in areas with bad conditions caused by lack of rain and4.(extreme) hot temperatures. One particular area is in a desert in North China’s Inner Mongolia. Over 70 kinds of crops are growing there. Many are not planted by humans but they just grow5.(they), And the costs of artificial materials and machines for transforming sand into soil is much6.(low) compared with regular methods. Now, nearly 500 acres of sand is being turned into farms producing corn,7.(tomato) and sunflowers. A reforestation (重造森林) project is also currently in progress,8.is set to reforest 50% of desert land in three years.

Researchers are looking into expanding their project this fall, with9.plan to transform another 500 acres of desert. In the next few years, the scientists are10.(confidence) that they can turn over 30,000 acres more into rich ground.

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