将电器金属外壳与大地作电气上的联接叫（）接地。 A.工作 B.保护 C.重复

Escaping a fire is a serious matter. If you know what to do during a fire, you can  __1__ a life. It is important to know the ways you can use and  __2__ them to everyone in the family, such as stairs and fire escapes(安全出口). You shouldn’t take lifts. From the lower floors of the building, escape __3__   windows is possible. Let’s learn the best way of leaving by window with the least chance of serious injury(受伤).
The first floor window is usually not very high from the  ___4____ . It is about the height of a man. Of course, it is safer to jump a short way than stay in a burning building.
Windows are also very useful when you are___5___ for help. Be sure to keep the door ___6__ before opening the window. If we don’t do that, ___7__and fire may come into the room. Keep your head low at the window to be sure you get__8__ fresh air instead of smoke.
On the second or third floor, the best windows for escape are those __9____open onto a roof. From the roof a person can drop to the ground more __10____ .Dropping onto the cement(水泥地) might end in injury. Trees and grass can help to break a fall.

小题1:	A．help B．make C．save D．give

小题2:	A．speak B．take C．show D．say

小题3:	A．out B．through C．into D．on

小题4:	A．roof B．earth C．land D．ground

小题5:	A．needing B．doing C．wanted D．waiting

小题6:	A．open B．closing C．opening D．closed

小题7:	A．firemen B．wind C．water D．smoke

小题8:	A．enough B．little C．a few D．few

小题9:	A．who B．what C．which D．where

小题10:.

A．dangerously

B．easy

C．safely

D．carefully