Although America is such a huge country,traveling is really

Although America is such a huge country,traveling is really very quick and easy.There are three ways to get across the country without a car：planes,trains and buses.Air travel is the most expensive of the three but in many ways the easiest and most comfortable.There are hundreds of flights a day crossing the country,and it is easy to make a reservation（预订）.Traveling by train is cheaper than by airplane.But it costs more than by bus and there are few passenger（旅客）trains.On the trains there are dining cars and bars where meals are served quickly.If you are spending the night on the train you can pay for a “roomette” which is a small room with a bed and a toilet.The most inexpensive way to travel is by bus.There are fast bus services between cities,for example,the Greyhound Bus Service.You can buy special tickets that allow you unlimited travel for a certain period of time.In this way you can stop along the way to visit the places that interest you most.
If you need to travel long distances frequently,however,you’ll have to decide which way is the most suitable for you.Hardly anyone can positively enjoy sitting in a train for more than a few hours.It is almost impossible to take your mind off the journey.Reading is only a partial solution.During the day,sleep comes in snatches（瞬间）.At night,when you really wish to go to sleep,you rarely manage to do so.Inevitably you arrive at you destination almost exhausted.Long car journeys are even less pleasant,for it is quite impossible even to read.On motorways you can,at least,travel safely at high speeds,but the greater part of the journey is spent on narrow,bumpy roads that are crowded with traffic.
By comparison,trip by sea offers a great variety of civilized comforts.You can stretch your legs on the spacious decks（甲板）,play games,swim,meet interesting people and enjoy good food.However,if the sea is rough,you are likely to get seasick.Even if you travel in ideal weather,sea journeys take a long time.

1、B 2、B 3、C 4、D 5、D
供参考
再问： 非常感谢~第一题 还有选项C by train ，D by bus 没有复制上