当肋骨间的肌肉和膈肌舒张使胸腔容积____时，肺便回缩，肺内的气体压力相应____，于是气体就被呼出．

如图所示，光滑水平地面上的小车质量为M，站在小车水平底板上的人质量为m．人用一根跨过定滑轮的绳子拉小车，定滑轮上下两侧的绳子都保持水平，不计绳与滑轮之间的摩擦．在人和车一起向右加速运动的过程中，下列说法正确的是（   ）

阅读理解
    A beautiful and very successful actress was the star for a new musical show. Her home was in the country, but she didn't want to go back there every night, so she bought an expensive house in the center of the city, got some beautiful furniture and got a man to paint the rooms in new colour.
    It was very difficult to get tickets for her show in the evening, because everyone wanted to see it. So she decided to give the painter two of the best seats. She hoped that this would make him work better for her. He took the tickets without saying anything, and she heard no more about them until the end of month, when she got the painter's bill. At the bottom of it were these words: “Four hours from 5:00 p.m. to 9:00 p.m. watching Miss Hall sing and dance: 3 pounds,”with this note: “Before 5:00 p.m. I get 10 shillings (先令)an hour and after 5:00 p.m. 15 shillings.”

2015不5月28日，中央电视台2015“寻找最美孝心少年”大型公益活动在央视网正式启动。这一活动的开展（    ）

①有利于弘扬中华民族孝老爱亲的传统美德    ②有利于促进家庭和谐

③有利于提高公民的思想道德水平                 ④是传播美德的唯一途径