Smoking is a very bad habit. First of all, Cigarettes are expensive. Smokers have to   小题1:   a lot of money buying them. That is a   小题2:  (浪费) of money. Smoking is bad for smokers’ h 小题3: . It may be responsible for many d  小题4:  . Even worse, it is harmful to people 小题5:   them. It is said that smoking is one of the ways to   (引起) cancer. Second, there can be fires  小题6:   can result in a great loss of life and property because of a smoker’s (粗心). 小题7:   , we are teenagers and have no income. We have no right to do that. It will be even worse if we f 小题8: into bad habits.

关于屋架的说法正确的是( )。

A．屋盖跨越的距离在18m以上，屋盖承重构件采用屋面大梁(简支梁)

B．施工制作简单，施工技术要求不高，适应性强

C．屋架的受力特点为节点荷载，所有杆件只受拉力和压力

D．我国的预应力混凝土屋架的跨度已达80多米