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His son never calls him        to ask for money.

    A.rather than          B.other than     C.more than      D.or rather

 

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    Dickson Despommier, a public health professor at Columbia University in New York City developed an idea with his students nine years ago. They imagined people in cities growing crops inside a tall building. Tomatoes could grow on one floor of the skyscraper(摩天大樓), potatoes on the next, small animals and fish on the floor above.

This vertical(垂直的) farm, or "farmscraper", could have space for restaurants and other places that serve food, like schools or hospitals. They could serve foods that are truly locally grown.

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The professor also points to the problems of traditional farms. They use a lot of freshwater. Their fertilizer and animal waste can pollute water resources. And their growing seasons can be limited.

But inside the vertical farm, crops could grow all year. And there would be no wind to blow away soil. Farmers would not have to worry about too much or too little rain, or about hot summers, freezing winters or insects. And without insects there would be no need for chemicals to kill them.

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Even buildings could be saved. Old buildings could become new farms and provide jobs.

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But he says the building would not have to be very tall. And his graduate students have found many empty lots and unused buildings in New York City that could provide space.

 

68.According to the passage the purpose of proposing the idea of a farm scraper is to      .

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       B.serve food that are truly locally grown

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       D.save fresh water

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