2015年是中国抗日战争暨世界反法西斯战争胜利70周年。为使全国人民广泛参与中央及各地区部门举行的纪念活动，国务院决定今年9月3日全国放假1天。请阅读下列材料，回答问题。

材料一  中国人民抗日战争是世界反法西斯战争的东方主战场。中国战场长期牵制和抗击了日本军国主义的主要兵力。中国国民党和***领导的抗日军队，分别担负着正面战场和敌后战场的作战任务，形成了共同抗击日本侵略者的战略态势。
——节选《***在纪念抗战胜利60周年大会上的讲话》
材料二  全面侵华八年，日军在中国战场伤亡130余万，居第二次世界大战中日军在各个战场伤亡人数之首。日军侵华的战费约121亿美元，相当它全部战费的35%。太平洋战争前，日本陆军3/5以上的兵力被牵制在中国战场上，从而减轻了日军对美英的打击。21世纪教育网版权所有
——吴于廑、齐世荣《世界史·现货史·上》
材料三  抗战胜利后，中国不仅收复了自甲午战争失败后割让给日本的台湾、澎湖列岛等所有的国土，而且在新成立的国际组织联合国中成为安全理事会的五个常任理事之一。

中华民族的历史是各民族共同缔造的，其中由少数民族建立的统一的封建王朝是(   )

下列角度中，不能成为多边形的内角和的是 （         )

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   The Healthy Habits Survey(调查)shows that only about one third of American seniors have correct habits. Here are some findings and expert advice.
1．How many times did you brush your teeth yesterday?
·Finding：A full 33% of seniors brush their teeth only once a day.
·Step：Remove the 300 types of bacteria in your mouth each morning with a battery－operated toothbrush. Brush gently for 2 minutes, at least twice a day.
2．How many times did you wash your hands or bathe yesterday?
·Finding：Seniors, on average, bathe fewer than 3 days a week. And nearly 30%wash their hands only 4 times a day—half of the number doctors recommend.
·Step：We touch our faces around 3,000 times a day－often inviting germs(病菌)to enter our mouth, nose, and eyes.Use toilet paper to avoid touching the door handle. And, most important, wash your hands often with hot running water and soap for 20 seconds.
3．How often do you think about fighting germs?
·Finding：Seniors are not fighting germs as well as they should.
·Step：Be aware of germs. Do you know it is not your toilet but your kitchen sponge(海绵)that can carry more germs than anything else? To kill these germs, keep your sponge in the microwave for 10 seconds.