1 Virology is often considered as a part of microbiology
2 Viruses can be classified according to the host cell they infect: animal viruses, plant viruses, fungal viruses,and bacteriophages (viruses infecting bacteria, which include the most complex viruses).
3 Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipidenvelope).
4 A virus is a small infectious agent that can replicate only inside the living cells of organisms.
5 Viruses are found in almost every ecosystem on Earth.
6 Viruses cause a number of diseases in eukaryotes.
7 Viral infections in animals provoke an immune response that usually eliminates the infecting virus.
8 The evolution of viruses, which often occurs in concert with the evolution of their hosts, is studied in the field of viral evolution.
9 While viruses reproduce and evolve, they don't engage in metabolism and depend on a host cell for reproduction.
2. My favourite program,which is Friendly people,is a comedy.
3.My friend Michael,who doesn't have any brothers or sosters,often comes to play with me
4.My sister,whose hair is brown,loves wearing hats.
5.New York,where I was born,is an enourmous city.
-Hello. My name is Tamara. What's your name?
-Hello. My name is Danielle. How are you?
-I'm good. What about you?
-I'm great. Nice to meet you.
-Nice to meet you too.
1 . The girl was cooking dinner when the lights went out . She burned herself . 2 . The boy hurt himself while he was skating . 3 . When the woman entered the room , the children were feeding the goldfish . 4 . When i was visiting my friends in Denmark,I bought two presents for my family . 5 . When it started to rain , we were bathimg in the river . 6 . Yesterday at one o'clock I had lunch at the canteen . 7 . When he came in , I doing my exercises . 8 . What did you do at eight o'clock yesterday ? 9 . At this time yesterday I went home . 10 . You were sleeping when I went out . 11 . He was reading on the sofa when I came in and ( sat down beside him . 12 . I was walking along the street with my friend when a tram passed . 13 . She was looking out of the window when I saw her . 14 . We were answering the teacher's questions when the headmistress entered the classroom . 15 . They were drinking tea when I came home .
<u>2. A: Are there any armchairs?
</u>
<em>B: Yes, there are.
</em>
<u>3. A: Is there a table?
</u>
<em>B: Yes, there is.
</em>
<u>4. A: Is there a cupboard?
</u>
<em>B: Yes, there is.
</em>
<u>5. A: Is there a desk?
</u>
<em>B: No, there isn't.
</em>
<u>6. A: Are there any mirrors?</u><u />
<em>B: No, there aren't.
</em>
<u>7. A: Are there any paintings?
</u>
<em>B: No, there aren't.</em>
