科研之友
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摘要
<正>在寒冷的冬天里,去买一杯桑迪和兰迪做的热可可吧。Sandy and Randy are selling hot cocoa.Each cup of hot cocoa costs 50 cents.They can make your hot cocoa with milk or with water.On the top of the hot cocoa,you can add cream or marshmallows.Most people prefer marshmallows.At the end of the day,Sandy and Randy make 10 dollars from selling hot cocoa.
