房屋调查与测绘是以( )为单元分户进行的。
A．小
B．组团
C．幢
D．院落
参考答案：C
解析：[知识点] 测绘中的基本概念
If penicillin _____________ available, many people ______________ from sickness.
A．weren’t , would have died
B．shouldn’t be, would die
C．hadn’t been, would have died
D．is, will die
必需氨基酸
