物质在不同条件下的三态变化，主要是由于构成物质的微粒（  ）

在圣诞来临之际，英国女王伊丽莎白二世于25日发表传统圣诞致词。她虽是英国国家的象征，但她并不掌握国家的最高权力，这种英王统而不治的政治制度源于哪一文件通过（    ）

阅读理解。   

     My name is Xiaoming. I get up at half past six. I have breakfast at seven o'clock. I go to school at eight o'clock. I have lunch at twelve o'clock. I go home at four o'clock. I have dinner at five o'clock. I watch TV at half past six. I do my homework at seven o;clock. I go to bed at nine o'clock.