Task 3 Прочитай реплики (а-в) и впиши соответствующие буквы в начало или конце диалога
a) - You shouldn't eat with your fingers
b) - I know, and I mustn't go out.
c) - No, you needn't. There is much food at home.
d) - Oh, yes, she is always ready to help.
e) - Why do you have to get up so early?
f) - Was it ? Did it rain all day?
B) - No, you mustn't. It's very cold today.
1. - Can I go and have a swim, Mum?
2. - Alice is such a nice and friendly girl.
3.
-.- I know, but there is no spoon here.
4. - The weather was terrible.
5. If you are ill, you should stay in bed.
6. Must I go shopping?
7.
- My classes begin at eight
Task 4 Choose the correct answer
1.Visitors can appreciate the contrast between past and present of London .
2.The transformations of old buildings and rediscovery of the city river .
3.To explore and observe historical delights or walk through the ages of The City of Londin the visitors can go on foot .
4.London is not a historical theme park. It is a lively and exciting metropolis with it expensive restaurants , unique boutiques and exclusive department stores .
5.Soho is the city's liveliest and the most bohemian area in London .
Despite its heavy traffic and shaking underground railway, it is still one of the world's greatest and most cosmopolitan cities.
решение. 1. ri=2*r; rii=r/2; ri/rii=4; не надо ни о какой площади сечения говорить. два куска проволоки содинили последовательно, получили ri=2*r; два куска той же проволоки соединили параллельно, получили rii=r/2; ну, а теперь раздели первое на второе!
а теперь общий случай: ri=r*n; rii=r/n; ri/rii=n^2; кусок проволоки разрезали на n одинаковых кусков. сначала эти куски соединяют последовательно: ri=r*n; затем соединяют параллельно rii=r/n; ну и дели первое на второе и делай выводы.