pet sb answer key u11

The natural world 11 Lead in p84 1 1 A 2 C 3 D 4 B 2 a natural habitat c dump b litter d global warming Reading p84 1 1992 when the ducks fell overboard 29,000 the number of ducks 10,0

The natural world 11

Lead in p84

1 1 A 2 C 3 D 4 B

2 a natural habitat c dump

b litter d global warming

Reading p84

1 1992 when the ducks fell overboard

29,000 the number of ducks

10,000 the number of containers lost every year

3,000 the number of kilometres the ducks

travelled to the North Pole

2 1 B If students wrongly answer D, explain that

the text says the ducks have helped scientists

understand how ocean currents work but the

text doesn’t explain in detail how the water

actually moves in the ocean

2 A Dr Ebbesmeyer realised that observing the

ducks can help us understand how ocean

currents work (line 17).

3 C The ducks are bleached and worn after so

much travelling (line 30) The expression (to

be) bleached means ‘to lose colour through

being exposed to the sun’

4 C If any students wrongly answer D, explain

that although the final paragraph mentions

that ‘some of the ducks have been found’, this

is not the main point of the article

Grammar p85

1 a 3 b 1 c 2 d 6 e 5 f 4

2 a zero = c, f first = a, b, d, c

3 Suggested answers

a … global warming will get worse

b … we don’t take action now

c … we will pollute the sea

d … we keep flying by aeroplane so much

e … don’t leave the TV on

Vocabulary p86

1 on 5 in

2 in 6 of

3 on 7 for

4 from 8 about

Grammar p86

1 a had d would buy / ’d buy

b would love / ’d love e hit

c were / was f would be / ’d be

3 1 unless

2 I’d take / I would take

3 you study

4 don’t / do not put

5 wouldn’t be / would not be

Listening p87

2 a ✗ I’d never been particularly interested in space.

b ✓ There are thousands of bits of rubbish up there

and the amount is growing.

c ✗ Skylab … fell into the Indian ocean and across

Western Australia.

3 1 B I came across a story = I found / discovered

a story by accident; I wasn’t looking for it

2 A We can eliminate options B and C because

the references to books and the Internet are

both negative: There aren’t many books the

Internet wasn’t that helpful.

3 B Adam says the bits of spacecraft and

astronauts’ tools are things you would expect,

but shows he is surprised by the ordinary

rubbish, because he says amazingly.

4 B The size of the rubbish and the material it’s

made from is not important: it can be of any

size and material, so we can eliminate

options A and C

5 C Adam doesn’t say that there are a lot or

that numbers are growing He says that the

amount of rubbish is increasing but not the

number of accidents, though perhaps the

number of accidents might increase as well

at some time in the future

6 C We can eliminate option A because it fell on

land (Western Australia) as well as sea We

can eliminate option B because bits of it fell

(i.e it fell in two places but it didn’t break

into just two pieces)

Vocabulary p88

1 a turn e run

b turn f fill

c throw g give

d pick

Speaking p88

3 1 c

2 b

Writing p89

1 Elena’s letter is about air pollution She helps by

cycling to school every day

2 Dear Maria

Thanks for your letter It was great to hear from you

You wanted to know about some of the environmental problems in my country In my opinion, the worst thing is air pollution There are too many cars in our cities If people used their cars less, it wouldn’t

be so bad

Last month, I bought a bike and now I cycle to

school every day This is much better for the

environment and it keeps me healthy too.

Write soon!

Elena