People in our part of the country like living in caves（窑洞，山洞）. It is a nicer and better living space than an ordinary (普通的,平常的)house. It’s warm in winter and cool in summer.

There are two kinds of caves, earth ones and stone ones. The earth caves are dug（挖）into the hill side. The first thing to do is to find a place with the right kind of soil. The soil should be of good quality(质量). Earth caves don’t last well. Usually they last only thirty years.

Stone caves are better and stronger. They are more expensive to build than both earth caves and ordinary houses. An ordinary houses won’t go more than thirty years without major repairs. A stone cave will last four or five hundred years. It doesn’t need major repairs. Sometimes you need just some paper, wood or paint for windows and walls.

People live in caves can enjoy the beauty of the nature all year round.

(  ) 1. The cave is _______

A. an ordinary house  B. a beautiful house  C. an office  D. a nicer and better living space

(  )2. The caves are _______

A. earth caves      B. stone caves    C. ordinary house   D. earth caves or stone caves

(  )3. About the earth, which of the following is wrong?