12．
Last summer，Maria and her mother moved from their house in the countryside to building in Chicago．Maria really liked some things about the city，but she missed her house and yard in the countryside．
One day，Maria was in her flat building when she noticed her neighbor，Mrs．Garcia，carrying a gardening tool and a bag of soil．Maria wondered how Mrs．Garcia was able to garden in the city．
"My mom used to grow the most delicious vegetables，and I know she misses her garden now that we don't have a yard，"said Maria．
Mrs．Garcia laughed．"I'll show you，"she said．
Maria thought that Mrs．Garcia would take her to the park，but she took her to the roof （屋顸）．When the door opened，Maria was surprised to see rows of flowers and vegetables on the roof．
"What a wonderful garden!"said Maria．
Mrs．Garcia told Maria that for a long time the roof was just an empty space．Then some of the people in the building asked the owners to turn it into a community garden．The building owners liked the idea because the plants not only helped to keep the air clean，but they also helped to keep the building cooler during warmer weather．
"I plant flowers in my own place，"Mrs．Garcia said，but you would be surprised by how different the plants are up here．Some people grow vegetables just like your mom．You can do some of the same things in the city as in the countryside．You just have to be creative!"
28．Which of the following is NOT the advantage of the community garden？D
A．It used the empty space well．
B．It helped keep the air clean
C．It helped keep the building cooler．
D．It made the building stronger
29．After Maria visited the garden，she would most probably ask her mom toC．
A．go back to the countryside
B．pick flowers from the garden
C．grow vegetables on the roof
D．show her around the park
30．What is the best title for this passage？B
A．A Creative Lady
B．A Rooftop Garden
C．An Empty Roof
D．A Special Building．
