Elena jogged (慢跑) with her dad in some empty lots (小块地). These out-of-the-way lots were good places to jog. But the lots were full of rocks and rubbish.
    One day, Elena saw a sign on the lots. It said, “New City Park”. Elena was excited. Maybe the park would have a jogging trail (路径)! Elena told her parents about the sign.
   “I read about the park in the newspaper,” said Elena's father. “The city wants volunteers to help clean the area. Then the city will build a soccer field and a playground. But the paper didn't mention a jogging trail.”
“Well, perhaps if I help clean up the lots, they'll put in a jogging trail,” said Elena.
    On Saturday Elena went to the lots. Many adults were working there. Some were picking up rubbish. Some were moving rocks. Elena looked around. She could carry rubbish, and she could move rocks. So she went to the area every week to do volunteer work. She told everyone she was glad to help build the park. She explained that she hoped the park would have a jogging trail. Then everyone knew her and her jogging trail.
Soon the volunteers cleared the lots. The city could start building. The mayor (市长) gave a speech. He showed a drawing of the new park. He told them about the soccer field. There would be picnic tables. There would be a playground. The park would even have basketball courts. But there was no sign of a jogging trail.
    The mayor thanked the volunteers. Then he asked if they had any suggestions. The volunteers said they wanted to build a jogging trail around the park. They told the mayor how helpful Elena had been and how she wanted a jogging trail. The mayor then said, “A jogging trail won't be hard to build. Let's do it!”
    Everyone clapped and cheered.

党的十八届三中全会审议通过的《中共中央关于全面深化改革若干重大问题的决定》指出；坚持权利平等、机会平等，规则平等，废除对非公有制经济各种形式的不合理规定，消除各种隐性壁垒，制定非公有制企业进入特许经营领域具体办法。这说明（    ）

以下城市景观中，通常情况下不常见的是（  ）

   Mrs. Thompson came to the 5th grade class and noticed that Teddy was always alone. Also, he did badly in his studies. When she reviewed Teddy’s past records，she find he was a good child at first，but he began to change when his mother got ill. Finally he lost interest in school after his mother’s death.
   Mrs.Thompson realized the problem and felt sorry for him. She felt even worse when her students brought her beautifully-covered Christmas presents. His presents were covered with some old paper. Some children laughed when she found a bracelet(手镯)with some of the stones missing, and a bottle with a little perfume(香水). But she said how pretty the bracelet was, putting it on, and dabbing some perfume on her hand. Teddy stayed after school for a long time just to say，“Mrs.Thompson，today you smelled just like my mom used to.” After the child left，she cried for quite a long time.
   On that very day，she taught not only knowledge but also children. As she worked with Teddy，his mind seemed to come alive. By the end of the year，Teddy had become one of the smartest children in the class.
   A year later，Teddy left school. She found a note under her door，from Teddy，saying that she was the best teacher he ever had in his life. After that, these words were repeated in each of his letters to her.
   Then after he finished college, Teddy wrote telling her that he had met a pretty girl and was going to get married. He explained that his father was dead，and that he wondered if Mrs.Thompson might sit at the wedding in the place for the mother of the groom(新郎).
Of course，Mrs.Thompson did. She wore the bracelet and the perfume that Teddy remembered his mother wearing on their last Christmas together.
   They hugged(拥抱)each other，and Teddy whispered in Mrs.Thompson's ear，“Thank you，Mrs.Thompson，for making me feel important，and showing me that I could make a difference. ”
   Mrs.Thompson，with tears in her eyes，whispered back，“Teddy，it's not like that. You were the one who taught me that I could make a difference. I didn’t know how to teach until I met you.”

已知集合A={x∈R|x＜$\frac{\mathrm{\pi }}{2}$}，B={1，2，3，4}，则（∁_RA）∩B=____