Despommier says the hydroponic greenhouses would use a system that would use a city's waste water and fill it with nutrition to make the crops grow. If this method works, it would provide food to a city and save millions of tons of water.

　　The idea of a vertical farm has attracted the attention of government officials around the world. Scott Stringer, a government official from New York City, thinks the city is suitable for the vertical farming. “Obviously we don't have much land left for us，” Stringer said, “But the sky is the limit in Manhattan.”

　　Despommier admits that there is still a lot of work to do to make vertical farms a reality. “But I think vertical farming is an idea that can work in a big way.” he says.

　　1．Why are people advised to eat local?

　　A．Because it means convenience to people.

　　B．Because it can help people save a lot of money.

　　C．Because local food has more nutrition.

　　D．Because it is environmentally friendly.

　　2．Which is one of the vertical farm's benefits when compared with ordinary farming?

　　A．It produces healthier food.

　　B．It does less harm to the cities.

　　C．It consumes more energy of the city.

　　D．It needs less space of the city.

　　3．By saying “the sky is the limit in Manhattan”， Stringer means ________.

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