In Seoul, many commputers prefer to take taxis to get to work. To hail_a_cab,_many people stand at crossroads and riase two fingers. This means they'll pay the cab driver double the usual fare. Some people even raise three fingers! They'll pay THREE times the normal rate.

　　Streets in Rome are very crowded with automobiles and mopeds(摩托自行车)during rush hours. The city can't make its streets wider, and it can't build new highways, because it doesn't want to disturb many historic sites in the city, such as the Forum and the Colosseum. It took the city fifteen years to construct a new subway system. Construction had to stop every time workers found old artifacts and discovered places of interest to archaeologists(考古学家)．

　　In many big cities, there are special lanes on highways for carpools. These are groups of three or more people who drive to and from work together. They share the costs of gas and parking and take turns driving into the city.

　　Getting to work and getting home can be difficult in many places around the world. Rush hour traffic seems to be a universal problem.

　　【语篇大意】 本文主要叙述世界各地的上下班时间。

　　40．Big cities have traffic problems during rush hours because there are ________.

　　A．speical lanes on highways

　　B．many commuters

　　C．four rush hours

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