多项选择题 民用建筑中，楼梯按材料分类，包括（）。

未知题型 A．It is supposed to be warm and sunny in terms of the weather forecast.B．It won't go like what the man expects according to the weather forecast.C．She believes it's suitable for the man to play football.D．She has no idea of how it will be like.

单项选择题 如果一位经济学家对检验1900—1930年间，联邦预算赤字是否是过度货币增长的原因十分感兴趣，他关注的是________的变动。