As everyone knows, there are many 　16　 of transportation in the world, like bicycles, buses, ships, trains and 　17　 .

If you are in big  18　like Shanghai or Beijing, maybe you get to school   19  a subway or you have to 　20　 to school because you live in a mountain village. Here I am just trying to say something about　21　 .

Ten years　22　, bicycles were very　23　in most villages.  24　 family had one or two of bicycles. Children got to school by bicycle; 　25　 rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries，bicycles are highly suggested

  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.

As everyone knows, there are many 　16　 of transportation in the world, like bicycles, buses, ships, trains and 　17　 .
If you are in big  18　like Shanghai or Beijing, maybe you get to school   19  a subway or you have to 　20　 to school because you live in a mountain village. Here I am just trying to say something about　21　 .
Ten years　22　, bicycles were very　23　in most villages.  24　 family had one or two of bicycles. Children got to school by bicycle; 　25　 rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries，bicycles are highly suggested
  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.

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　　If you are in a town in western country, you’ll often see people walking with their dogs. It is still true that a dog is the most useful animal in the world, but the reason why one keeps a dog. has changed. Once upon a time, a man met a dog and wanted it to help him in the fight against other animals, and he found that the dog listened to him and did what he told to. Later people used dogs for the hunting of other animals, and the dogs did not eat what they got until their master agreed. So dogs were used for driving sheep and guarding chickens. But now the people in towns and cities do not need dogs to fight against other animals. Of course they keep them to frighten thieves, but the most important reason is that people feel lonely in the city. For a child, a dog is his best friend when he has no friends to play with. For a young wife, a dog is her child when she doesn’t have her own. For old people. a dog is also a child when their real children have grown up and left. Now people do not have to use a dog. but they keep it as a friend, just like a member of the family.

1．________ are mote useful than a dog in the world.

[　　]

2．In the past people kept dogs because dogs ________.

[　　]

A．could fight

B．met the people

C．did not eat other animals

D．helped and listened to people

3．Now people keep dogs in the cities because dogs ________.

[　　]

A．fight against other animals

B．are lonely

C．are like their friends

D．are afraid of the thieves

4．A dog can be ________.

[　　]

A．a child’s friend only

B．a young woman’s son

C．old people’s real child

D．everybody’s friend

5．So a dog will ________ in a family.

[　　]

What ________ you do if you were in the desert?

[　　]

A．will　　B．do　　C．would