【单选题】American consumers like convenience very much. During the last 50 years, there has been a dramatic increase in such labor-saving devices as automatic washing machines, clothes dryers, dishwashers, foo...
A.
a shortage of labor force in America
B.
people's need to reduce the time spent on housework
C.
Americans' interest in doing housework
D.
the quick change of American family life
【单选题】She hasn't written to me ______.
【简答题】During the last six months, there was a boom of sea creature in California and whalesare not the only ones. 查看材料
【单选题】My life has changed a lot during the ____________ years.
【单选题】样本或总体中各不同类别数值之间的比值称为
【判断题】通常认为,管理信息系统主要解决结构化的决策问题,而决策支持系统则以支持半结构化和非结构化决策问题为目的。
【单选题】子供を 助けるために あの人は 服を ( )まま 川に 飛び込みました。