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  When a tornado destroys a house, it doesn’t blow it down the way a hurricane(十二级台风)does. It makes the house explode(爆炸). When air that surrounds a house presses against it all time, it usually has a force of about 15 pounds per square inch. The air inside the house presses out against the walks 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 causes a house to ________.

[  ]

Aexplode

Bshake

Cfall down

(2) The walls of a house stay when ________.

[  ]

Aair pushes from the outside

Bair pushes from the inside

Cthere is a different kind of pressure

(3) The air pressure outside the house is usually ________.

Agreater than the air pressure inside

Bthe same as the air pressure inside

Cless than the air pressure inside

(4) The walls of a house are pushed out when ________.

[  ]

Athe air outside is taken away

Bthe air inside is taken away

Ctoo much air is pushing outside

(5) A house destroyed by a tornado would look ________.

[  ]

Aas if there had been a fire

Blike a pile of wood

Cas if a bomb(炸弹)had exploded in it

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1Ato

  

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Cwith

  

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[  ]

  

2Ait

  

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