题目内容：

B

Escaping a fire is a serious matter: knowing what to do during a fire can save life. It is important to know the way you can use and show them to everyone in the family, such as stairs and fire escapes, but not lifts. From the lower floors of building, escape through windows is possible. Learn the best way of leaving by window with the least chance of serious injury.

The second floor window is usually not very high from the ground. A person of average height, hanging by the fingertips will have a drop of about 6 feet to the ground. It is about the height of an average man. Of course, it is safer to jump a short way than to stay in a burning building.

Windows are also very useful when you are waiting for help. Be sure to keep the door closed before opening the window. Otherwise, smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get enough fresh air rather than smoke that may have leaked into the room.

On a second or third floor, the best windows for escape are those which open onto a roof. From the roof a person can drop to the ground more safely. Dropping onto the cement might end in injury. Bushes and grass can help to break a fall.

69. Which of the following people seldom use when trying to escape a fire?

A. Windows.                        B. Doors.                                   C. Fire escapes.             D. Lifts.

70. How far from the ground to the second floor window?

A. About 12 feet.                                                           B. About 3 feet.

C. Nearly 10 feet.                                                           D. About height of an average man.

71. The writer tells us that ______.

breathing in smoke might not be harmful

smoke will enter the room by an open window

fresh air can’t reach the second floor

to keep your head low will help you escape a fire