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阅读理解Ata bright new building in Landover, Maryland, students are getting a crashcourse(速成课),in which they are learning how to spend, save and look aftertheir money responsibly.Tuesdaymarked the grand opening of the newest Junior Achievement Finance Park， where eighth-gradersfrom Prince George's County schools will use tablet computers to practicepersonal finance skills they have learned in class. An international study lastyear clearly showed that more than 1 in 6 U. S. teens is unable to make simplechoices about how to spend their money.Thecenter, a mini city of stores, was cre下列有关有机化合物的说法正确的是（ ）A．用水可以区分乙酸乙酯和苯B．有机物分子中都存在碳碳单键C．聚乙烯属于高分子化合物D．乙醇、油脂、淀粉是人们必需的营养物