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1787年联邦《宪法》规定，美国国家的管理形式是总统制的共和国，国家机关建立的原则是______
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Do you wake up every day feeling too tired, or even upset If so, then a new alarm clock could be just for you. The clock, called SleepSmart, measures your sleep cycle, and waits【C1】______you to be in your lightest phase of sleep【C2】______ rousing you. Its makers say that should 【C3】______you wake up feeling refreshed every morning. As you sleep you pass【C4】______ a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that 【C5】______ approximately every 90 minutes. The point in that cycle at which you wake can【C6】______how you feel later, and may【C7】______ have a greater impact than how much or little you have slept. Being roused during a light phase 【C8】______you are more likely to wake up energetic. SleepSmart 【C9】______ the distinct pattern of brain waves 【C10】______during each phase of sleep, via a headband equipped 【C11】______ electrodes and a microprocessor. This measures the electrical activity of the wearer" s brain, in much the【C12】______way as some machines used for medical and research【C13】______ , and communicates wirelessly with a clock unit near the bed. You【C14】______the clock with the latest time at 【C15】______you want to be wakened, and it 【C16】______duly wakes you during the last light sleep phase before that. The 【C17】______was invented by a group of students at Brown University in Rhode Island 【C18】______ a friend complained of waking up tired and performing poorly on a test."【C19】______sleep-deprived people ourselves, we started thinking of【C20】______to do about it," says Eric Shashoua, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea. 【C20】
在美国的宪法文件中，以解决各州之间的权力关系为核心问题的是______
世界上第一部近代意义上的成文宪法是______
《法律重述》是______
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