城域网是介于广域网与局域网之间的一种高速网络。城域网设计的目标是要满足几十公里范围内的大量企业、机关、公司的 Ⅰ．多个计算机互联的需求 Ⅱ．多个局域网互联的需求 Ⅲ．多个广域网互联的需求 Ⅳ．多个SDH网互联的需求

A. one hundred miles

B. three hundred miles

C. one hundred and fifty miles

D. six hundred miles

A. flowers and vegetables from Devon are on the market one month earlier

B. farmers in the southwest grow as many vegetables and flowers as farmers elsewhere

C. people in the southwest have to pay a higher price for vegetables and flowers

D. vegetables in Cornwall ripen as much as a month earlier than flowers . .

A. it is cold and wet all the year round

B. the climate is pleasant as a whole

C. it is warm most of the time in a year

D. only the summer is not cold. or wet

A. much less

B. some more

C. far less

D. far more

A. put up with

B. fall in with

C. do away with

D. get along with

A. faded

B. torn

C. dirty

D. crushed

A. beautiful

B. natural

C. artificial

D. similar