单选题：阅读材料，回答题：Long bus RideLong bus rides are like television sho

阅读材料，回答题：
Long bus Ride
Long bus rides are like television shows. They have A．beginning, amiddle, and an end--with commercials thrown in every three or four minutes. The commercials are unavoidable. Theyhappen whether you want them or not. Every couple of minutes A．billB．oard glides by outside thebus window. "buy Super Clean Toothpaste. " "Drink Good'n Wet Root beer. " "Fill up with Pa-cificGas. " Only if you sleep, which is equal to turning the television set off, are you spared theunending cry of "You Need It! buy It Now!"
The beginning of the ride is comfortaB．le and somewhat exciting, even if you've traveled thatway before. Usually some things have changed--new houses, new buildings, sometimes even anew road. The bus driver has A．style of driving and it's fun to try to figure it out the first hour orso. If the driver is particularly reckless or daring, the ride can be as thrilling as A．suspense story.
Will the driver pass the truck in time? Will the driver move into the right or the left-hand lane?
After awhile, of course, the excitement dies down. Sleeping for awhile helps pass the middlehours of the ride. Food always makes bus rides more interesting. but you've got to be careful ofwhat kind of food you eat. Too much salty food can make you very thirsty between stops.
The end of the ride is somewhat like the beginning. You know it will soon be over and there'sakind of expectation and excitement in that. The seat, of course, has become harder as the hourshave passed. by now you've sat with your legs crossed, with your hands crossed behind your head.
The end comes just at the right time. There are just no more ways to sit.
According to the passage, what do the passengers usually see when they are on A．long bus trip? A．B．uses on the road.
B．films on television.
C．advertisements on the board.
D．gas stations.