сделать правильно!! Очень нужно Ex. 1. Read the text, using the dictionary
EVOLUTION OF THE HEART
Beginning with the invertebrates, the lowest members of the animal kingdom, the heart is a simple propulsive muscular tube. In the fish the heart has evolved into a chambered organ with an atrium, or receiving chamber, and a ventricle, a thick-walled pumping chamber. This development was necessary because the vertebrates of which the fish are the lowest class have a more complicated structure and are generally larger than the invertebrates and require more oxygen. With the development of lungs in the higher vertebrates the atrium became divided into two parts by the formation of a dividing wall called septum.
Thus, in man and other animals with a four-chambered heart blood from the body cells enters the heart at the right atrium, and from here it passes into the right ventricle from which the blood is pumped through the pulmonary artery towards the lungs. The oxygenated blood is carried back to the heart through the pulmonary veins which empty into the left atrium. From the left atrium the blood passes into the left ventricle which then pumps it into the aorta for the distribution throughout the body.
Ex. 2. Complete the sentences:
1. An atrium is …
2. A ventricle is a …
3. The septum is …
4. Blood enters the heart …
5. Then it passes ...
6. The blood is pumped … towards the lungs.
7. The oxygenated blood is carried back to the heart …
8. They empty …
9. The left ventricle pumps the blood …
1. а) Tim was very exhausted. He tried keeping his eyes open, but he couldn't
b) James needed to borrow some money. He tried
to ask his best friend, but he was short of money, too.
c) Kids tried to put
the fireout but didn't succeed. Finally,someone called the firebrigade.
d) Kate rang the doorbell, but nobody answered. Then she tried
to knock on the door, but there was still nothing.
e) .A baby tried to
reach the toy on the table, but he wasn't tall enough.
f) Could you leave my room for some time? I'm trying to concentrate
2.
а)Our grandparents aren't able to look after themselves anymore. They need looking after.
b) Your hair is getting too long. It needs to cut
c) There is no need
in ironing my skirt. It looks nice and doesn't need
d) My coat is dirty. It needs cleaning
e) We worked hard and need a rest now. We want to
go away to a warm country for a short break.
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