1 - e
2 - d
3 - b
4 - f
5 - a
6 - c
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.
<span>1) James said
they would be at home after six. </span>
<span>2) Betty didn’t want anything to eat. She promised she would have something later. </span>
<span>3) If it rains, I don’t think we will go boating. </span>
<span>4) Steve said he would phone me in the evening. </span>
<span>5) Diana explained she would finish the job at the end of the week. </span>
<span>6) If you work late hours every night, you will have a headache in the end.</span>
1. The dean of our faculty can speak three languages.2. The great Russian mathematician N I Lobachevsky could become a professor in 23 years old yet.3. Oleg tries to translate the text today, because he understands that it is not able to do it tomorrow.4. You have to work hard to become an experienced lawyer5. She should not have to change her flat to country house6. In the spring the children should eat more vitamins7. At the beginning of the year they were supposed go to Spain , but could not8. Children should not watch TV after ten9. You should learn how to cook by yourself10. Has collection already begun? -It Started half an hour ago