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  3. In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp live in indoor pools. What’s going on?

In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp live in indoor pools. What’s going on?

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问题     In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp live in indoor pools. What’s going on? Food research!
    People perform these experiments to learn how to produce more food. There will be over 6. 5 billion people on earth after two decades. We will have to produce four times as much food as we do now to feed all these people. But each year there is less fresh water, the soil loses nutrients and buildings take up more land. We must learn to use resources we have always thought unusable. So, the Environmental Research Laboratory in Arizona tries to grow food without soil, in the desert, and with salt water.
    So far the results have been excellent. The new methods yield twenty times more tomatoes and cucumbers than can be grown on a farm. About sixty times as many shrimp can be raised in indoors pools than ten boats can catch in the ocean in a year. Crops can grow in salty soil. Plus, as they grow, they take salt and minerals from desert soil, to create more useable land.
    The University of Arizona runs the research center in Arizona. But there are centers all over the world. Because of the promising results, big companies pay for some of the research. With interest and money backing them, researchers can go far. Their aim is to use wasted land and water to feed humanity. In the Arizona desert, they are off to a great start.
People must produce more food because______.
选项 A、people get hungrier every year
B、the population of the world is growing
C、there are too many unemployed farmers
D、people do not like the food now produced
答案B
解析 第二段。文中提及人口的增长，并说在未来要生产如今产量4倍的食品。可见人口的增长是很严重的。选项B是正确的。其他选项文章未提及。
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