①There are many different houses in the world. They can be different because people are different. The houses can also be different because of where they are. Houses can be made in many shapes.

② The dome house

Some people live in windy places. Big winds, like hurricanes, can blow houses down. In one place, a house was made in the shape of a dome. When a big hurricane came, it didn't blow down. However, all the other houses around it did. A dome house is made of triangle shapes. The shape of the dome house lets the wind go around it. A house with a flat wall is not as safe in a strong wind. A dome house doesn't have a roof to blow off. There is no wind in a dome house, so it is safer in a fire. It is safe from termites（白蟻）,too. There is no wood for them to eat!

③A ball-shaped house

Some houses have been made in a shape like a ball. The walls, celing and floor are all one in a house with this shape. The wind moves around-the outside of the house. Ball-shaped houses can be hung from things or float on water.

④ ▲

A house on the ground can take up a lot of space. A house in a tree doesn't use any space on the ground at all. No trees have to be chopped down to make room for these houses. And the tree housed can be built in the shape of bee nest（巢）. Such a house doesn't take very long to move to a new place. So it is helpful during the natural disasters.

⑤ A walking house

Some people have made a house that can walk. It is the shape of a long hexagon. The house has six legs. It can walk over any ground. It can even walk over bumpy ground. When it walks, three legs are always on the ground. A walking house would be very good if there was a flood or a fire.

⑥ Different shapes of house are so useful that different people can choose whatever they need. Which one do you prefer? Probably you can create another different shape of house one day!

1.How many shapes of house are introduced in the article?

A.Four. B.Five. C.Six. D.Seven.

2.What advantage does a dome house have?

A.It takes up little space. B.It can protect from the strong wind.

C.It can walk over any ground. D.It has more beautiful shapes.

3.Which one could be put in the ▲ ?

A.A house in a tree B.A house in space

C.A running house D.A flying house

4.How is the passage organized?

A. B. C. D.

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