甲、乙、丙以相同的速度经过某一路标后，甲仍匀速，乙先加速度后减速，丙先减速后加速，经过下一个路标时，三车速度仍相同（   ）

阅读材料，完成下列要求。

材料一：18世纪早期，英国城市人数约占总人口的20%-25%，1801年为33%，而到1851年时，英国已有580多座城镇，城镇人口占总人口的54%，英国已基本上实现了城市化。工业革命的深入发展，城市就业机会增多，形成了一股吸引农村移民的强大拉力。随着技术革新在棉纺织领域的展开，轻工城市率先异军突起。煤炭工业、冶金工业的发展，产生了一批能源和重工业城市。另外，交通运输业的变革，亦给英国平添了一批新的交通枢纽城市。城市化改变了英国的经济地理状况，使英国由一个封闭分散的农牧社会变为一个经济一体化的城市文明社会。

——摘编自陆伟芳《简析近代英国城市化的特征》

材料二：鸦片战争后，商埠的开放成为中国近代口岸城市兴起的契机。1842年，中英《南京条约》签订后，中国由广州一口贸易变为五口通商。第二次鸦片战争后，除开放沿海一系列口岸以外，又增辟了长江流域的沿江口岸。与此同时，在我国广大西南、西北的内陆边疆地区，陆路商埠城市也得到一定的发展。这类城市在北方有张家口、库伦、恰克图；西北有嘉峪关、喀什、伊犁、塔城；西南有云南的河口、思茅，广西的龙州，西藏的亚东、江孜等城市。以上内陆城市与沿海、沿江城同组成了我国近代口岸城市体系。——摘编自田兵权《中国近代城市转型问题初探》

把下列句子组成语意连贯的语段，排序最恰当的一项是（    ）
①艺术知识是对已发生过的艺术现象的理性记录，其本身是非艺术的
②因为他所知道的这些东西本身是历史的而非军事的
③但是，艺术修养的根基并不在艺术知识中
④艺术知识，只是艺术修养大题目下的一种后补性、扩展性的内容
⑤一个有高度艺术修养的人当然会有比较充分的艺术知识
⑥这正像知道欧洲战争史常识和拿破仑生平的人未必有真正的军事修养

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    Many facts suggest that children are overweight (超重的) and the situation is getting worse, according to the doctors. I feel there are a number of reasons for this.

    Some people blame the fact that we are surrounded by shops selling unhealthy, fatty foods, such as fried chicken and ice cream, at low prices. This has turned out a whole generation of grown-ups who seldom cook a meal for themselves. If there were fewer of these restaurants, then probably children would buy less take-away food.

    There is another argument that blames parents for allowing their children to become overweight. I agree with this, because good eating habits begin early in life, long before children start to visit fast food shops. If children are given fried chicken and chocolate rather than healthy food, or are always allowed to choose what they eat, they will go for sweet and salty foods every time, and this will carry on throughout their lives.

    There is a third reason for this situation. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games. Not only is this an unhealthy pastime (消遣), it also gives them time to eat more unhealthy food. What they need is to go outside and play active games or sports.

    The above are the main reasons for this problem, and therefore we have to encourage young people to be more active, as well as steering them away from fast food shops and bad eating habits.