54．A．both             B．too                  C．also

53．A．In this way      B．By the way           C．On the way

52．A．have             B．there are            C．there have、

51．A．by               B．take                 C．get

50．A．have to stop     B．don’t have to stop  C．needn’t to stop

49．A．help             B．can’t               C．need

48．A．spend             B．cost                C．take

47．A．small             B．big                 C．more

46．A．road              B．way                 C．place

45．―― _______________?

――Delicious．I enjoyed it very much．

A．What’s your favorite food     

B．How do you like the food

C．Would you like some more food 

D．Do you like the food

    From London to New York，from Hong Kong to Moscow，subways are an  important 46 of transportion(运输)．Traffic in  47  cities is often quite heavy，and it can sometimes 48 hours to cross  a busy city in car or bus．Subways  49 solve that problem，because they 50 at traffic  lights，and hundreds of people can 51 a subway train together．In larger subways systems(系统)，such as Mexico  City’s，52 lines that go far beyond the city center．53，people living in the suburbs can take a train to work．This reduces(减少)the traffic entering and leaving a city．It  54 helps reduce air pollution，a big problem in many cities．At last，subways are usually cheaper．In fact，in a city  55  a subway，everybody wins !