Hong Kong, major commercial center for Asia, and with a population which has grown at an alarming rate to over 5 million, is a city highly dependent on mass (大量的, 大规模的) transit of all sorts, both local and long distance. An ordinary Hong Kong worker or businessman, going about his daily activities, simply must use transportation at one time or another.    
Because Hong Kong is in two parts, Kowloon, on the mainland side, and Hong Kong, the island, with Hong Kong's harbor in between Hong Kong's mass transit systems, in addition to going over land they must also cross water.    
Going from home to work, or going shopping from one side of the harbor to the other, the Hong Kong resident has three choices. One way is to take a bus which will cross the harbor through an under water traffic tunnel moving slowly through bumper- to-bumper (一辆接一辆) traffic．Another way is by ferry boat , a pleasant ride which crosses the harbor in from seven to fifteen  minutes.    
But by far the fastest way of crossing the harbor is the newly built underground electric railway, the Hong Kong Metro(地铁). If one gets on the train in the Central District,the commercial area of Hong Kong on the island side, he can speed across the harbor in an astonishing three minutes. On the other side of the harbor the railway continues, snaking back and forth through the outlying districts of Kowloon, allowing one to get off a short distance from his destination.    
The story of the Metro is an encouraging one for supporters of mass transit. Although building the system was certainly a challenging task, the Japanese firm hired to construct it did so in record time. Construction got underway in 1979 and it was completed in 1980.    
For the average commuter (一般持月票往返两地的乘客) the system has only one disadvantage; it is more expensive than by bus or ferry. One can ride the bus across the harbor for half as much or he can ride the ferry across for less than one-fifth as much.
Hong Kong public transportation extends ________.

A．over hills and valleys	B．across land and water
C．through mountains	D．throughout the Kowloon area

Crossing the harbor by train is ________. 

A．by far the most economical methods

B．the most pleasant method

C．the least pleasant method

D．the fastest method

The business area on the island side of Hong Kong is referred to as ________.  

A．Kowloon	B．the Central District
C．the Hong Kong Metro	D．downtown Hong Kong

The underground railway ________.   

A．winds through Kowloon	B．ends when it reaches Kowloon
C．snakes across the harbor	D．circles Kowloon