1. Radiation consists of three types of rays.
2. Radiation is not harmful in all cases.
3. As you move upwards from the surface of the Earth, the effects of this radiation goes on increasing.
4. Overexposure to these radiations, can alter the DNA of animals by the ionizing effect, it produces.
5. Overexposure to nuclear radiations from the Sun or nuclear tragedies can cause sunburn, melanoma or different types of cancers.
6. There is a parameter called radiation absorbed dose (rad), that gives an idea about the effects of radiation that bombards a human body.
7. There are some certain positive effects of radiation such as radio therapy.
8. Radiation can be put to both constructive and destructive uses.
Exercise 21. Give extra information about
Alpha rays
Beta rays
Gamma rays
Chernobyl disaster
Other disasters on nuclear plants
Exercise 22. Discuss the benefits and risks of the nuclear industry.
TEST YOURSELF
I ______ anything since breakfast so I feel very thirsty now.
| A.wasn't drinking | B.didn't drink | C.haven't drunk |
I ______. to the cinema since I came to the UK.
| A.didn't go | B.haven't gone | C.hasn't gone |
3. My math teacher wasn't happy yesterday. I ______ to bring my workbook to class.
| A.forgot | B.forget | C.have forgotten |
4. I like your watch. How long. ______ it?
| A.did you have | B.have you had | C.are you having |
5. Have you ever ridden a horse? - No, but I ______ a camel when I visited Egypt last year.
| A.was riding | B.rode | C.have ridden |
6. ______my pen? I can't find it anywhere?
| A.Have you seen | B.You saw | C.Did you see |
7. My grandmother ______ for 61 years before dying at the age of 90!
| A.smoked | B.was smoking | C.has smoked |
I went to the school dance last Friday, but I______it very much.
| A.haven't enjoyed | B.dont enjoy | C.didn't enjoy |
9. Who ______ the thermometer?
| A.invents | B.invented | C.has invented |
I bought a new computer last week, but it ______ so I took it back to the shop.
| A.didn't work | B.hasn't worked | C.doesn't work |
11. I ______ late for school again this morning. The teacher was not happy!
| A.arrive | B.m arriving | C.have arrived |
12. My sister ______ a baby. She's going to call it James.
| A.had | B.has had | C.was having |
I ______ my foot playing tennis last week, and now I can hardly walk.
| A.injured | B.have injured | C.was injuring |
I was in a big hurry so I ______ no time to phone you.
| A.have | B.had | C.was having |
15. That's a lovely scarf! Where ______ it?
| A.did you buy | B.do you buy | C.have you bought |
16. Have you seen my pencil? It was here a minute ago and now it______.
| A.has disappeared | B.it disappeared | C.it was disappearing |
I ______ very well last night. There was loud music coming from a house down the road.
| A.didn't sleep | B.haven't slept | C.wasn't sleeping |
18. ______ my hand on a piece of glass. Do you have a Band-Aid?
|
|
|
| A.I cut | B.I've cut | C.I was cutting |
19. " Where's Brianna?" - " ______ to the library!"
| A.She's gone | B.She goes | C.She is going |
20. Where ______? I _______ for you everywhere!
| A.you have been, m looking | B.have you been, look | C.were you, ve looked |
UNIT 6
GRAMMAR: PRESENT PERFECT CONTINUOUS
TEXTS: THE ROLE OF GRAVITY; FFECTS OF WATCHING TOO MUCH TV
