人体皮肤干燥又未破损时，人体电阻一般为（）Ω。A.1000～2000；  B.400

                                                  Street Markets Around the World  
      There are many ways of shopping. You can shop by telephone, by post or through your home
computer, but for many people, the most exciting way to shop is also the most traditional-at a
street market. You can find markets anywhere in the world. Here are four of them:   
      There are many “floating markets” in Asia; perhaps the most unusual is Thailand(泰国), at a
place called Damned Saduak. It’s open from six in the morning to the noon every day. People sell
fresh fruit from their boats.   Many Belgians(比利时人) say that the Grand Place is the most beautiful
square in the world. It’s the home of a colourful flower market. It’s open every day except
Monday. On Monday, instead of flowers, there’s a wonderful bird market.   
     One of the world’s famous markets is in Mexico City(墨西哥城)-the Sonora Market. You can
buy toys, birds, herbs and medicine. There’re all kinds of things. It’s open every day from early
in the morning till late at night.   In England, every weekend, thousands of young people from all over
London travel to the Camden Market-it’s the place to go for street fashion, CDs and tapes. Many
people also go there for fun.