During the 1st century AD (year 100), glass had been invented and the Romans were looking through the glass and testing it.
They
(experiment) with different shapes of clear glass and one of their samples
(be) thick in the middle and thin on the edges. They
(discover) that if you
(hold) one of these "lenses"
over an object, the object would look larger.
The early simple "microscopes"
(be) really only magnifying glasses.
Sometime about the year 1590, two Dutch spectacle makers, Zaccharias Janssen and his father Hans
(start) experimenting with these lenses. They
(put)
several lenses in a tube and
(make) a very important discovery. The object near the end
of the tube
(appear) to be greatly enlarged, much larger than any simple magnifying
glass
(can) achieve by itself! They had just invented the compound microscope (which is
a microscope that uses two or more lenses).
Galileo
(hear) of their experiments and
(begin)
experimenting on his own. He
(describe) the principles of lenses and light rays and
(improve) both the microscope and telescope. He
(add) a focusing device to his microscope and of course
(go) on to explore the heavens
with his telescopes.
Anthony Leeuwenhoek of Holland
magnifying glasses in a dry goods store. He
(learn) how to make lenses. He
(get) very interested in lenses while working with
(become) so interested that he
(see) bacteria,
TOVAUVA

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Ответы на вопрос:

емдетей

Английский язык

4,7(18 оценок)

the dos and don’ts for people visiting russia

if you are going to visit a country for the first time you should learn its traditions and rules. russia is not the exception from the rule. there are some rules:

1. don’t shake hands with your gloves on. it is impolite.

2. don’t shake in a doorway. russians consider it bad luck to do so.

3. don't make joke about the other's family. family is very much respected in russia.

4. always respect the elderly. on buses or other transportations you should give priority to the elderly.

5. don't give empty wallet as present. russians consider it bad luck. if you want to give someone wallet as a present, put some money in it.

6. don't let women carry stuffs

men have to be gallant to women by helping them open the door or carrying stuffs for them.

7. don't whistle in the house. in russia, it is a bad luck of finance

8. don't wear shoes in the house. the russian always leave the shoes in front of the door.

9.don't join a part with empty hands. when you visit a russian family, always bring some gifts such as a wine bottle, a bouquet of flowers.

10. don’t give sharp things like a knife, a mirror and a watch as a present. russians consider it bad luck.

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