(B) What are you going to do if you are in a burning house?
Escaping(逃离) a fire is a serious matter. Knowing what to do during a fire can save yourself. It is important to know the ways you can use and to show them to everyone in the family, such as stairways (楼梯) and fire escapes, but not lifts（电梯）.
From the lower floors of the building, escaping through windows is possible, learn the best way of leaving through windows with the least chance of serious injury (伤害).
The second floor windows are usually not very high from the ground. An average (普通的) person, hanging by the finger-tips will have a drop of about six 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 useful when you are waiting for help. Be sure to keep the door closed, or smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get fresh air rather than smoke that may have leaked (渗入) into the room.
On a second or third floor, the best windows for escaping are those which open onto a roof . From the roof a person can drop to the ground more safely, dropping onto stones might end in injury.
【小题1】From the beginning, we know that it is important to       .

阅读理解

　　Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

　　You can easily find out the pull of the earth. If you weigh (称体重) yourself, you will know how much gravity is pulling you.

　　Since there is gravity, water runs downhill. When you throw a ball into the air, it falls back down. Because of gravity you don't fall off the earth as it whirls (旋转) around.

　　Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go so fast that it can escape (逃离)the earth's gravity and carry you into space.

(1) In this passage (文章), the word “gravity” means

[　　]

A. the pull of everything

B. the force (力) which attracts (吸引) the earth towards us

C. the force of attraction among things

D. the force which attracts things towards the center of the earth

(2) When you slip (滑倒)on something, you

[　　]

A. always fall down to the ground

B. sometimes fall down to the ground

C. go up into the air

D. often fall off the earth

(3) Gravity is so strong that ________

[　　]

A. it can't make you throw a ball into the air

B. it can keep everything on the earth

C. you can jump at least seven feet high

D. you can't go up into the air by spaceship

(4) Because of “gravity ”,________

[　　]

A. water flows (流) everywhere

B. we can go everywhere by ship

C. water flows downwards on the earth

D. water flows at the foot of hills

(5) We can get away from the earth by spaceship because

[　　]

A. the spaceship goes very fast

B. the earth has no gravity to the spaceship

C. the spaceship has a strange energy (能量)

D. the spaceship can go higher than any other thing on the earth

阅读理解

　　Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

　　You can easily find out the pull of the earth. If you weigh (称体重) yourself, you will know how much gravity is pulling you.

　　Since there is gravity, water runs downhill. When you throw a ball into the air, it falls back down. Because of gravity you don't fall off the earth as it whirls (旋转) around.

　　Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go so fast that it can escape (逃离)the earth's gravity and carry you into space.

(1) In this passage (文章), the word “gravity” means

[　　]

A. the pull of everything

B. the force (力) which attracts (吸引) the earth towards us

C. the force of attraction among things

D. the force which attracts things towards the center of the earth

(2) When you slip (滑倒)on something, you

[　　]

A. always fall down to the ground

B. sometimes fall down to the ground

C. go up into the air

D. often fall off the earth

(3) Gravity is so strong that ________

[　　]

A. it can't make you throw a ball into the air

B. it can keep everything on the earth

C. you can jump at least seven feet high

D. you can't go up into the air by spaceship

(4) Because of “gravity ”,________

[　　]

A. water flows (流) everywhere

B. we can go everywhere by ship

C. water flows downwards on the earth

D. water flows at the foot of hills

(5) We can get away from the earth by spaceship because

[　　]

A. the spaceship goes very fast

B. the earth has no gravity to the spaceship

C. the spaceship has a strange energy (能量)

D. the spaceship can go higher than any other thing on the earth