Young persons under twenty-five make up nearly half of the American population.什么意思?翻译

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• Young persons under twenty-five make up nearly half of the American population.什么意思?翻译
• Young persons under twenty-five make up nearly half of the American population.什么意思?翻译
• Millions of words have been writeen about young people in the United States.There are r______Millions of words have been written about young people in the United States.There are r___ for this great interest in the ideas,feelings,and actions of youth.Today there are about seven million Americans in colleges and universities.Young persons under twenty-five make up nearly h___ pf the American population.Many of these will soon be in charge of the nation
• 给首字母填词语 Millions of words have witten about young people in the United States.There are r_____for this great interest in the ideas,feelings,and actions of youth.Today there are about seven million Americans in colleges and universities.Young persons under twenty-five make up nearly h______ of the American population.Many of these will soon be in c_____ of the nation.Naturally their ideas are important to everyone in the country,and it is necessary for
• 某人从五楼走到一楼的过程中，重力做了6×103J的功，则（　　） A.人的重力势能减少了6×103J B.人的动能减少了6×103J C.人的机械能增加了6×103J D.人的机械能始终保持不变
• 缩略类英文6个