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蛋白质一级结构是（）
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2004年，中央政府决定在全国实行省以下土地垂直管理体制，以进一步加强国家对国土资源的宏观调控，实行最严格的耕地保护制度。( )
张某2002年取得大专学历，从事相关工作满两年后，于2005年考试通过获得土地估价师资格，但因其他原因于2006年被取消土地估价师资格。按照土地估价师资格考试管理办法，张某2009年可以重新报名参加土地估价师考试。( )
简述中华人民共和国主席的职权。
A recent reality TV, program called "Metamorphosis (Bian Xingji)" has stirred up debate. The program, which aired on Human Satellite TV, offers two primary school students a chance to exchange life roles. For one week, Gao Zhanxi, a poor country boy from Qinghai, and Wei Cheng, a rich city boy from Hunan, walked in each other’s shoes. Many people praised the program because it changed the kids in good ways. Wei has decided to throw away his former extravagant lifestyle and keep away from Internet games. Gao opened his eyes to see a wonderful world outside the mountains. But others don’t agree. They think the program actually hurt Gao a lot. He actually wept when he first tasted modern life. People doubt whether he will turn to his poor family willingly without feeling the inequality of life after experiencing the colorfulness of city life. Someone says,"Gao is just too young to experience the huge gap between his country life and the far-too-good modern city life. He may think that life hasn’t treated him fairly. He may even hate society’s inequality. The program hurts him, for sure.\ What does the word "air" in the first line mean ______.
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