题目内容：

阅读短文，根据要求完成下面各小题。

Rain helps plants grow and stay green. But too much rain-especially in cities-can cause flooding. And that can make waste water systems, like sewers(下水道), flow and send polluted water into rivers and other water ways. So several cities in the United States are stating programs like rooftop(屋顶) gardens.

A team at the University of the District of Columbia has created a garden on the top of one school building.83The garden holds many kinds of plants to help receive rain water and grow food at the same time.

"It took advantage of the resource above the city that you see all over where you have these flat roofs that aren't doing anything and it really made it something that was about urban agriculture."

84Rainwater is collected in large bottles and sent through a system that waters the garden at the top of the roof. The roof is filled with green life that appeals(吸引) to insects.

"In cities, you don't have that much space, so rooftops are just unused space," says Caitlin Arlotta, a student in the school's Urban Agriculture program.

The program is growing plants including strawberries, tomatoes and sweet potatoes. "We have the same experiment running with tomatoes as we do with strawberries, so we're doing variety trials(品种实验) and we're trying just to see which variety grows the best in a green roof setting."

The program also seeks to improve cities and make them beautiful by training people to become Master Gardeners.

It is the biggest surprise that they produced 4,250 pounds of products the first year and shared that to people in need.

A.根据短文内容简要回答问题。

1.Why do the cities in US start programs like rooftop gardens？

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2.What does the schools Urban Agriculture program do according to the passage？

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B.将短文中划线的句子译成汉语。

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C.请给短文拟一个适当的英文标题。

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