阅读理解。
     Shenzhen is a city in South China. It is not very big, but it has attracted people of the whole country and
  the whole world as well.
     Just about twenty years ago, it was only a small fishing village. There were not many people there. Most
  of them lived on fishing. Things have greatly changed since the 1980's. It became the first special
  economic zone (经济特区) in China.
     Because of the opening policy (政策), economic changes between China and the outside world have
  increased greatly. People can come and go easily between Shenzhen and Hong Kong. Both foreigners
 and Chinese have built a lot of factories, companies and tourists' attractions there. People all over the
  country have come to find jobs. Many of them have settled down in this new booming (兴起的) city.
     Shenzhen is developing so fast that it has become a well－known metropolis (大都市) in China.
1. Shenzhen lies _____ China.
    A. in south of
    B. to south of
    C. in north of
    D. on south of
2. About twenty years ago most of the people in Shenzhen _____. 
    A. worked in the factories
    B. did housework
    C. caught fish for a living
    D. lived a happy life
3. When did Shenzhen become a special economic zone?
    A. 十九世纪八十年代.
    B. 二十世纪八十年代.
    C. 十九世纪八十年代初.
    D. 十八世纪九十年代.
4. What have foreigners done in Shenzhen?
    A. They have come to visit their friends.
    B. They have built a lot of factories and companies.
    C. They have got plenty of money from China.
    D. They have come to buy things.
5. Many of them have settled down in this new booming city. "settled down" means _____.
    A. made down
    B. sat down
    C. began to work
    D. stayed there