语篇理解

　　When a tornado (龙卷风) destroys a house, it doesn't blow it down the way a hurricane (十二级台风) does. It makes the house explode. Why does the house explode?

　　The air that surrounds a house presses against it all the time. It usually has a force of about fifteen pounds per square inch. The air inside the house presses out against the walls just as hard. When a tornado passes over a house, it suddenly sucks away the air outside the house. The air inside the house still pushes out against the walls, but now there is nothing pushing back. So the walls are pushed out in an explosion.

　　Pieces of the house are sucked up into the tornado and carried away. There is little left where the house once stood.

1．A tornado makes a house ______.

[　　]

A．explode　　　B．blow away　　　C．fall down　　　D．catch fire

2．The walls of a house stay up when ______.

[　　]

A．air pushes from the outside

B．air pushes from the inside

C．there is no pressure on them

D．air pushes from both the outside and the inside

3．In paragraph 2, the sentence “The air inside the house presses out against the walls just as hard.” means ______,

A．the air in side the house presses out more greatly than the air outside

B．the air pressure outside the house is usually the same as the pressure inside

C．the air pressure inside the house is usually less than the pressure outside

D．the air pressure inside the house is just as difficult as the pressure outside

4．A house’s walls are pushed out when ______.

[　　]

A．the air outside is taken away

B．the air inside is taken away

C．too much air is pushing outside

D．they are in very poor conditions

5．A house destroyed by a tornado would look ______.

[　　]

A．as if a hurricane had hit it

B．as if there had been a fire

C．like a pile of wood

D．as if a bomb had exploded in it

阅读理解：

　　When a tornado(龙卷风) destroys a house, it doesn’t blow it down the way a hurricane(十二级台风) does. It makes the house explode. Why does the house explode?

　　The air that surrounds a house presses against it all the time. It usually has a force of about fifteen pounds per square inch. The air inside the house presses out against the walls just as hard. When a tornado passes over a house, it suddenly sucks away the air outside the house. The air inside the house still pushes out against the walls, but now there is nothing pushing back. So the walls are pushed out in an explosion.

　　Pieces of the house are sucked up into the tornado and carried away. There is little left where the house once stood.

1．A tornado makes a house ______.

　[　　]

A．explode　　　　B．blow away

C．fall down　　　D．catch fire

2．The walls of a house stay up when ______.　　　

[　　]

A．air pushes from the outside

B．air pushes from the inside

C．there is no pressure on them

D．air pushes from both the outside and the inside

3．In paragraph 2, the sentence “The air inside the house presses out against the walls just as hard.” Means ______.　　　

[　　]

A．the air inside the house presses out more greatly than the air outside

B．the air pressure outside the house is usually the same as the pressure inside

C．the air pressure inside the house is usually less than the pressure outside

D．the air pressure inside the house is just as difficult as the pressure outside

4．A house’s walls are pushed out when ______.　　　

[　　]

A．the air outside is taken away

B．the air inside is taken away

C．too much air is pushing outside

D．they are in very poor conditions

5．A house destroyed by a tornado would look ______.　　

　[　　]

A．as if a hurricane had hit it.

B．as if there had been a fire

C．like a pile of wood

D．as if a bomb had exploded in it