悠悠千载，诚信，作为一种中华民族的美德，走过了秦汉，历经了隋唐，见证了旧的灭亡，激励了新的成长。几千年来，“一诺千金”、“一言九鼎”、“言必信、行必果”等佳话不绝于史，广为流传。
******指出，我们要自觉做到诚信、襟怀坦白、言行一致，，对党忠诚老实，对群众忠诚老实。
***指出，要全方位提高失信成本，让守信者处处受益、失信者寸步难行，要加强诚信文化建设，让诚实守信成为全社会共同的价值追求和行为准则。
在现代生活中，由于市场经济的利益驱动，社会上出现了不少不讲诚信、缺乏信用的现象，如假冒伪劣商品、毒米毒酒事件、价格欺诈、做假账、搞假唱、打假球、吹黑哨……这些不诚信行为不但有违于道德，不少还触犯了法律，严重危害了社会的健康发展。

    Beijing Opera is also called Peking Opera. It came into being after 1790 when the famous four Anhui opera troupes(戏班) came to Beijing. Its music and singing(唱腔) come from Xipi and Erhuang in Anhui and Hubei. Its costumes are all fascinating and artistic. It is the highest expression of the Chinese culture. It's full of famous stories, beautiful facial paintings, and wonderful gestures and fighting. This kind of opera is very popular with Chinese people.
    There are four main roles in Beijing Opera: Sheng, Dan, Jing and Chou. Sheng is the leading male(男性) actor. For example, a Wusheng is a soldier or fighter. A Xiaosheng is a young man. A Laosheng is an old man. Dan is the female(女性) role. Jing, mostly male, is the face-painted role and Chou is the comedy actor or clown.
    Stories in Beijing Opera are very interesting. Some of them are from the history book, but most of them are from the literature, especially famous novels. The people in the story usually have some disagreements. They become angry and unhappy. They are sad and lonely. Sometimes they are nervous and worried. Then they find a way to make peace. The stories usually end with happiness and laughter and people are all happy in the end.

中国航空历经百年飞翔历史，正迎来崭新的空天时代．飞机的部分结构是由铝合金制成的，主要利用了铝合金的物理性质是____（答一点即可）．飞行员经常要进行高强度的体能训练，他们所穿的服装通常是由纤维织成的，为增强耐磨性和弹性，往往加入涤纶、锦纶等，它们属于____纤维；在营养方面，每天都要食用一定量的鸡蛋、牛奶，这些食物为人体提供的营养素主要是____．为了补充维生素．还要食用一定量的蔬菜，蔬菜在生长过程中常需施用化肥，在化肥的种类中氨水属于____肥．浓氨水有挥发性，挥发出的氨气能与氯气（C1₂）反应生成空气中的一种单质和一种遇水蒸气能形成白雾的化合物，试写出发生反应的化学方程式____，该反应前后氯元素的化合价分别为____ 价．

如何正确地骑自行车？

青少年要多吃蛋、奶、鱼等含蛋白质丰富的食物．因为蛋白质是（   ）