笛子是通过从吹孔向管内灌气引起空气柱 ____而发声的，演奏时，通过分别开闭六个音孔，笛子就能发出 ____（填“音调”、“响度”或“音色”）不同的声音．

按照“科教兴农、人才强农、新型职业农民国家”的要求，农业部于2014年7月正式启动实施新型职业农民培育工程。2015年，中央财政安排11亿元经费继续推进该项工作。与传统培训不同，新型职业农民培育包括新型职业农民成长的全过程，即教育培育、认定管理和政策扶持等。从哲学角度看，这一转变（       ）

①体现了辩证的否定是事物发展的环节     

②体现了创造性思维能检验和发展真理

③坚持了矛盾的普遍性与特殊性的统一     

④通过变革生产关系促进了生产力发展

— Daming, what do you ____ of Tony?

— He is not only friendly but also helpful.

    Every year there is a Spring Festival in China. Usually it is in January or February. It is the most important festival in China. So before it comes, everyone has to prepare things. They buy pork, beef, chicken, fruits and many other things. And they often make a special kind of food—“dumplings”. It means “come together”. On the day before the festival, parents buy new clothes for their children. Children also buy presents for their parents. On the Spring Festival Eve（除夕）, all the family members come back to their hometown. This is a happy moment. Some sing and dance，some play cards and others get the dinner ready. When they are having dinner, they give each other the best wishes for the coming year. They all have a good time.