1) During this period the track structure has been substantially improved.
One of the greatest improvements was the elimination of rail joints. In
order to reduce the number of joints the rails are welded into
continuous lengths.These continuous or long welded rails have greater
strength and provide a smoother running of trains at far greater speeds.
2) Another improvement which has made it possible to increase speeds on
railways is the use of concrete sleepers. Thus in some countries ,
concrete sleepers have replaced wooden ones on heavily used main lines
because of their advantages.
Concrete sleepers have a longer life
and a far greater weight than those made of wood. The greater weight of
concrete sleepers provides the greater stability of track.
It is this factor which has greatly contributed to increased speeds.
Ответ взял прямо из текста. Насколько я помню, так надо делать в подобных заданиях.
1. John's a vegetarian. He doesn't eat meat.
2. A) Where are you going?
B) I am going to the bank.
3. How many children does your sister have?
4. A) I am looking for a pair of black shoes.
B) Certainly. What size do you take?
5. A) Why is Hans studying Chinese?
B) Because he is going to China on holiday.
6. A) Bonjour! Ca va?
B) Sorry. I don't understand. I don't speak French.
7. A) What do you want to do tonight?
B) Why do we go and see James?
8. We can't, because he is working late tonight.
This is my room.My room is <span>beautifull.I have lot of toys</span>
Have you ever been too tired to go out?
Were you hungry enough to have a big breakfast?
Are you strong enough to carry a friend?
Is your sports team good enough to win the league?
Is your house big enough to have a party?