Modern life is impossible without traveling.The fastest way

Modern life is impossible without traveling.The fastest way of traveling is by plane.With a modern airliner(客机),you can travel in one day to places which needed a month or more to get to hundreds of years ago.
Traveling by train is slower than by plane,but you can see the places you are traveling through.Modern trains have comfortable seats and dining-cars.They even make the longest journey enjoyable(令人愉快的).
Some people prefer to travel by sea.You can visit many other countries or different parts of your country.Ships are not so fast as trains or planes,but traveling by sea is a very pleasant way to spend a holiday.
Many people like to travel by car.You can make your own timetable.You can travel three or four hundred miles or only fifty or one hundred miles a day,just as you like.You can stop if there is something interesting,for example,at a good restaurant where you can enjoy a good meal,or at a hotel to spend the night.That’s why traveling by car is popular for pleasure trips,while people usually take a train or a plane when they travel on business.
( )1.From the passage,we know the fastest way of traveling is ____.
A.by train B.by sea C.by plane D.by car
( )2.If we travel by car,we can ____.
A.make the longest journey enjoyable
B.travel to a very far place in a few minutes
C.make our own timetable
D.visit many other countries
( )3.The underlined word “They” in the passage refers to(指的是) ____.
A.modern trains in the country B.the comfortable seats and dining-cars
C.the travelers on the modern trains D.the slower ways of traveling
( )4.When people travel on business,they usually take ____.
A.a plane or a car B.a car or a boat
C.a boat or a train D.a train or a plane
( )5.How many ways of traveling are mentioned in the passage?
A.Four.B.Three.C.Two.D.Six.
抄这可累死我了,请讲出原因啊啊啊
对了，划线的是第二段的they

1.C 第二句,最快的旅行方式是乘飞机.
2.C 第四段第二句有写,许多人喜欢开车旅行,你可以自己掌握时间.而A项是火车可提供的,B项是指飞机,D项则是描述乘船旅行.
3.B 文中第二段画线词之前提到现代火车提供comfortable seats and dining-cars,正是这些使长途旅行也倍感愉快.
4.D 文中最后一句,当人们出差旅行时,通常乘火车或飞机.
5.A 因为依次提到plane,train,ship,car这四种交通工具.