Being not far from the sea, London is famous for its fog（雾）。The worst of them happened on December 4,1952. All movement in the town came to a stop. It was almost impossible to drive or ride in anything. The streets which lead to the center were filled with buses that moved two miles an hour. Soon, however, the traffic was stopped. Being left by their drivers, the buses and cars stood empty in the streets. Many who usually traveled by bus took underground（地铁）. But there were so many people there that the gates had to be closed. Being caught in the fog, people felt their way along the walls of houses with one hand, while they put out the other in front of them so as not to knock against something or somebody.

   At the Opera House（歌剧院）they got through the first act（幕）of La Traviata before so much fog had spread into the building that the singers could not see the conductor.

   It was a terrible fog, indeed, and as many as 4 000 people in London lost their lives.

66. The best title of this passage is “      ”

The Drivers                    B. How to Drive

C. The London Fog                  D. Many people died in the Fog

67. The street which led into the center were filled with buses that       

A. ran fast                                      B. moved slowly   

C. were out of order                            D. moved rapidly

68. Those who         in the fog had to feel their way along the walls of the house in order not to knock against something or somebody.

A. were able to drive                 B. took the understanding 

C. were caught                      D. lost their lives

69. Spreading into the building, the fog       

died out soon                            B. disappear at once

C. stopped the singers from seeing the conductor    D. was unable to be seen

70. Big fog often happens in London because       .

there is a lot of snow in the city    B. the city is famous for its fog

C.  the city is far from the sea        D. the city is near the sea