В19 веке в этой организации активно проводились исследования, способствовавшие ведению всеобщего времени а)лондонксое королевское общество в)гринвичская обсерватория с)оксфордский университет

гринвичская обсерватория..не так давно проходила..

environmental pollution is one of the largest problems in our today’s world. it can be defined as a contamination of air, water and land from man-made waste. nowadays there aren’t any cities and hardly any rural areas that remain clean and unpolluted.

there are a lot of different types of pollution among which the most recognized are air and water pollution, soil and radioactive contamination, littering, noise, light and thermal pollution. unfortunately, most of the problems are the result of human activities. indeed, the contradictions between man and nature are on a high level.

people cut down forests and thus damage thousands of acres of land. first of all, the soil  can be easily blown away and secondly, even if new trees are planted, they can’t bring back the old forests that were a part of a complex ecosystem that cleaned the air and made home for wildlife.

big industrial cities produce a lot of waste every day. it’s either thrown away or dug up which leads to the releasing of dangerous chemicals into the soil. very often toxic or poisonous liquid chemicals are poured into the water therefore people’s health is put at risk. however, they are themselves responsible for this.

water and air pollution  are also a serious threat to our environment. the main factors contributing to  them are car fumes, oil spills, throwing litter and many others. polluted air and water affect people’s health to such an extent that millions of them have got no access to safe drinking water.

in conclusion, it must be said that if we want to live in a better and healthier world we should take great care of our mother nature and learn to protect it.

1) 'do you know this man? ' yes, i work with him. 2) i'm talking to you. please, listen to me. 3) these photographs are nice. do you want to look at them? 4) i like that camera. i'm going to buy it. 5) where are the tickets? i can't find them! 6) we're going out. you can come with us. 7) i don't like dogs. i'm afraid of them. 8) where is she? i want to talk to her. 9) those apples are bad. don't eat them. следующее : 1) i want those books. please give them to me. 2) he wants the key. please, give it to him. 3) she wants the key. please, give it to her. 4) i want the letter. please, give it to me. 5) they want the money. please, give it to them. 6) we want the photographs. please, give it to us.