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grow crops for humans.About 24.7 million acres of land is lost to agriculture each yearbecause the land has become too salty.The main cause of the problem is irrigation(灌溉).When farmers water their crops, salts in the water also enter the soil.Over time, salts such as sodium(钠)and calcium build up to such a pointthat they severely harm the growth of crops.Salts destroy most plants' ability to draw up water through their roots.But, the new variety of tomato produced by Americanand Canadian scientists can store salts in its leavesso that the fruit doesn't taste salty.Researchers hope this technology will enable areas of poor quality land to become productive. And they can feed some of the world's growing population. Questions
1. What does this passage mainly tell us?
2. What is the significance of the new technology? 3. What will happen by 2025 according to the passage?
全汇总整编大学英语（第二版）听说教学方案计划教育教程3英语听力原文分析情况总结
