1. the poincaré conjecture.
in 2002, the russian mathematician grigori perelman proved the poincaré conjecture. this is a very serious discovery in mathematics. it was one of the seven tasks of the millennium. for this work, he received the prestigious fields medal, an analogue of the nobel prize in mathematics.
2. quantum clock.
quantum clocks are the most accurate chronometer in the world, surpassing all previously existing ones. nobel laureates of 2012 serge arosh and david wineland made a discovery that allowed to overcome the quantum barrier.
3. the discovery of eris.
the eris is the second after the massive pluto massive dwarf planet of the solar system. it was the discovery of eris from pluto that ceased to be the ninth planet, and passed into the category of "dwarf".
4. created the first synthetic bacterial cell.
in 2010, scientists from the craig venter institute created the first fully synthetic chromosome with the genome. when it was embedded in a bacterial cell devoid of genetic material, it began to function and divide according to the laws prescribed by the new genome.
5. higgs boson.
this was experimental evidence of the existence of the higgs boson. the practical significance of the discovery of the higgs boson is that scientists are opening up prospects for the development of anti-gravity and the development of engines that do not require energy to operate.
Поделитесь своими знаниями, ответьте на вопрос:
Вставьте this , that, these , those
Answer:
6. Hello, this is Mr Cook. Can I speak to Mr Brown, please?
7. I can’t go out in this coat. It’s too tight.
8. ‘I’ve been accepted by my first choice of university.’ ‘Congratulations. that is fantastic!’
9. Those were the days when we used to dance every night.
10. Don’t you think those new electronic diaries that we saw in the shop are really clever?
11. ‘This belonged to my grandmother,’ said David as he slipped the ring onto Jane’s finger.
12. Don’t you think these jeans suit me?
13. These biscuits are delicious. Did you make them yourself?
14. Those records you threw out were my original hits from the seventies!
15. Aren’t those girls over there your students?
16. ‘This bike needs repairing.’ ‘That is what I was trying to tell you.’
17. What do you think of that dress Ann was wearing last night?
18. I don’t go anywhere this week.
19. What’s this you’re reading?
20. That boy over there is my son.
Good luck!