11 The natural world Lead in 1A a natural habitat b litter 2C 3D Reading Grammar p84 4B c dump d global warming a3 a zero = c, f first = a, b, d, c b1 c2 d6 e5 f4 Suggested answers a b c d e p84 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 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 A Dr Ebbesmeyer realised that observing the ducks can help us understand how ocean currents work (line 17) 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’ 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 24 p85 … … … … … global warming will get worse we don’t take action now we will pollute the sea we keep flying by aeroplane so much don’t leave the TV on Vocabulary on in on from Grammar p86 in of for about p86 a had b would love / ’d love c were / was 3 d would buy / ’d buy e hit f would be / ’d be unless I’d take / I would take you study don’t / not put wouldn’t be / would not be PET Result © Oxford University Press Listening 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 B I came across a story = I found / discovered a story by accident; I wasn’t looking for it 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 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 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 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 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 a b c d turn turn throw pick Speaking Writing p87 p89 Elena’s letter is about air pollution She helps by cycling to school every day 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 p88 e run f fill g give p88 c b PET Result © Oxford University Press 25