【单选题】C#语言中的结构类型变量属于( )变量。
【单选题】________ the news, so far, has been good, there may be days ahead when it is bad.
【单选题】Why did people have big problems in the early days of the old West in North America?
A.
Because they didn't work.
B.
Because life was too easy.
C.
Because people lived far away from each other.
【判断题】人参总皂苷无溶血作用,主要是由于A型人参皂苷有抗溶血作用。