Which sentence best shows the central idea of the excerpt?
O "Elizabethans do not understand infection and
contagion as we do."
O "It is not that they are completely ignorant as to how
illnesses spread—physicians believe they know
perfectly wellit is rather that their understanding is
very different from ours."
O "The principal ideas underpinning most Elizabethan
medical thinking come from Galen, who lived in the
second century A. D."
O "If there is too much choler in your body, you will grow
choleric; too much blood and you will be sanguine, too
much phlegm and you will be phlegmatic; and too
much black bile makes you melancholic."

nobody can deny that cars are the most used means of transport all over the world. however owing a car could have some disadvantages. first of all, having a car on your own allows you to go everywhere without depending on timetables. moreover, you can use it whenever you need it no matter the time or the climate conditions. furthermore, if you have a car, you would not have to wait for nobody to share it when going to somewhere. nevertheless, one major disadvantages of owing a car is the fact that fuel is very expensive nowadays so that not everyone can afford it. in addition, you have to pay insurance to be protected by legal conditions. apart from this, the person who owns a car always has to maintain the car and repair any mechanical problem which could costs a huge amount of money. what is more, if you have to travel long distances, and you do not like driving, one probably would be exhausted and irritated due to driving for a long time. besides, cars cause environmental pollution. to sum up, owing a car means that you have more freedom to travel whenever and wherever people want to, however the car maintenance could be a very expensive issue that can have bad consequences at your economy.

what are the following?