消防安全管理的基本单元是（）。
A．政府
B．部门
C．单位
D．个人
参考答案：C
解析：
单位是社会的基本单元,也是社会消防安全管理的基本单元。
三. 句型转换 ( 10分)
1. If we want to lose weight, we must go on a diet.
We must have a _________________ _____________ to keep healthy.
2. The blind man made a living by begging on the roadside.
The blind man ___________ ________ _________ by begging on the roadside.
3. You have become fatter than before; I think you should lose weight.
You have _________ ________ _____________; I think you’d better lose weight.
4. Eating more vegetables will benefit you a lot.
Eating more vegetables will ___________ ___________ ___________ to you.
5. Having watched TV for too long, I felt it boring.
Having watched TV for too long, I __________ ____________ ________ it.
桁架结构形式与载荷均已知。结构中零杆数为（）。
A.零根
B.2根
C.4根
D.6根
均已知。结构中零杆数为（）。