缺乏哪一种维生素可引起坏血病的（）
A.维生素C
B.维生素K
C.维生素B
D.维生素PP
E.维生素D
参考答案：A
---What did he want to know, Anne?
---He asked ____________we could finish painting the room.
A．When was it
B．when it was that
C．It was when
D．It was when that
计算机最初的发明是为了______。
A．过程控制
B．信息处理
C．计算机辅助制造
D．科学计算
