剑桥雅思19收集了雅思考试真题共4套题目。羊驼雅思整理了剑雅19考试题Test 4的阅读题Passage 2回忆版，供考生们备考时复习参考。
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Test 4
READING PASSAGE 2
You should spend about 20 minutes on Questions 14-26. which are based on Reading Passage 2.
Deep-sea mining
Bacteria from the ocean floor can beat superbugs and cancer, But habitats are at risk from the hunger for marine minerals
A
When Professor Mat Upton found that a mierobe fiom a deep-sea sponge was killing pathogenic bugs in his laboratory, he realised it could be a breaktluough in the fight against antibiotic-resistant superbugs.which are responsible for thousands of deaths a year in the UK alone. Further tesls confrmed thal an antibiotic from the sponge bacteria, fotnd living more than 700 metres under the sea at the Rockall trough in the north-east Atlantic, was previously unknown to science, boosting its potential as a lifc-saving medicine. But Upton, and other scienlisls who view the deep ocean and ils wealth ol unique and undocumented species as a prospecting ground for new medicines, fear such potential will be lost in the rush to exploit the deep sea's equally rich metal and mineral resourees.
B
'We're looking al the bioaclive potential of marine resources, to see if there are any more medicines or drugs down there before we destroy it for cver,' says Upton, a medical microbiologist at the Universily ofPlymouth, He is among many scientists urging a halt lo
deep-sea mining, asking for time to weigh up the pros and cons.'In sustainability terms, this could be a better way of exploiting the economic potential of the deep sea,' he argues. Oceanographers using remotely operaled vehicles have spolled many new species. Among them have been sea cucumbers with tails allowing them to sail along the ocean Hoor, and a rare 'Dumbo' octopus, found 3.000 metres under the Pacihc Ocean, off the coast of California. Any one of these could otfer lifesaving polential, Upton estimates it could lake up to a decade for a newly cliscovcred anlibiotic lo become a medicine - but the race towards commercial mining in lhe ocean abyss has already begun.
C
The deep sea contains more nickel, cobalt and rare earth melals than all land reserves combined, according to the US Geological Survey. Mining corporalions argue that deep-sea exploration could help diversily the supply of metals and point to the faet that demand for resources such as copper, aluminium, cobalt for eleclric car batteries and other metals to power lcchnology and smartphones, is soaring, They say that deep-sea mining could yield far superior ore to land mining with little, ifany, waste. Different methods ofextraction exist, bul most involve employing some form ol'convered machinery previously used in terrestrial mining to excavate materials liom the sea lloor, at depths ofup to 6.000 melres, then drawing a seawaler slurry, containing rock and other solid parlicles, lrom the sea lloor lo ships on the surlace. The slurry is then 'de-watered' and translerred to another vessel for shipping Extracled seawaler is pumped back clown and discharged close lo the sea floor.
D
But environmental and legal groups have urged caution, arguing there are potentially massive and unknown ramifications for the environment and for nearby communities, and that the global regulatory framework is not yet drafted. 'Despite arising in the last half century, the 'new global gold rush' of deep-sea mining shares many features with past resource scrambles- including a general disregard for environmental and social impacts, and the marginalisation of indigenous peoples and their rights,’ a paper, written by Julie Hunter and Julian Aguon, from Blue Ocean Law, and Pradeep Singh, firom the Center for Marine Environmental Sciences, Bremen, argues, The authors say that knowledge of the deep seabed remains extremely limited. *The surlace ofthe Moon, Mars and even Venus have all been mapped and studied in much greater detail, leading marine scientists to commonly remark that, with respect to the deep sea, 'We don't yet know what we need to know.'
E
Scientific research - including a recent paper in Marine Policy journal - has suggested the deep seabed, and hydrothermal vents, which are created when seawater meets volcanic magma, have crucial impacts upon biodiversity and the global climate. The mineral-rich vents and thcir surrounds are also home to many well-known animals including crustaceans, tubeworms, clams, slugs, anemones and fish, 'It is bccoming incrcasingly clear that deep-sea mining poses a grave threat to these vital seabed functions,' the paper says.'Extraction methods would produce large sediment plumes and involve the discharge of waste back into the ocean, signifcantly disturbing seafloor environments,' the paper continues.'On deep sea vents, scientists are clear,' says Dr Jon Copley of the National Oceanography Centre, Southampton: 'we don't want mining on them.
F
The oceans occupy around 70% of the planet and are relatively unexplored, says Mike Johnston, chiefexecutive ofNautilus, a Canadian underwater exploration company: *It makes sense to explore this untapped potential in an environmentally sustainable way, instead of continually looking at the fast depleting land resources of the planet to meet sociely's rising needs.’ Those leading the global rush to place giant mining machines thousands of metres below the sea surface say the environmental impacts will be far
lower than on land, But critics say exotic and little-known ecosystems in the deep oceans could be destroyed and must be protected, 'Mining will be the greatest assault on deep-sea ecosystems ever inficted by humans,' according to hydrothermal vent expert Verena Tunnicliffe, at the University of Victoria in Canada. She argues that active vents must be off-limits for mining to protect the new knowledge and biotechnology spin-offs they can deliver, and that strict controls must be in place elsewhere.
Questions 14-17
Reading Passage 2 has six paragraphs, A-F
Which paragraph contains the following information?
Write the correct letter, A-F, in boxes 14-17 on your answer sheet.
14 reference to the rapidly increasing need for one raw material in the transport industry
15 a rough estimate of the area of the Earth covered by the oceans
16 how a particular underwater habitat, where minerals and organisms co-exist, is formed
17 reference to the fact that the countries of the world have yet to agree on rules for the exploration of the seabed
Questions 18-23
Look at the following statements (Questions 18-23) and the list of people below.
Match each statement with the correct person or people, A-E.
Write the correct letter, A-E, in boxes 18-23 on your answer sheet.
NB You may use any letter more than once.
18 A move away from the exploration of heavily mined reserves on land is a good idea
19 The negative effects of undersea exploration on local areas and their inhabitants are being ignored.
20 There are more worthwhile things to extract from the sea than minerals.
21 No other form of human exploration will have such a destructive impact on marine life as deep-sea mining.
22 More is known about outer space than about what lies beneath the oceans.
23 There is one marine life habitat where experts agree mining should not take place.
List of People
| A Professor Mat Upton B Julie Hunter, Julian Aguon and Pradeep Singh C Dr Jon Copley D Mike Johnston E Verena Tunnicliffe |
Questions 24-26
Complete the summary below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 24-26 on your answer sheet.
Mining the sea floor
Mining corporations believe that the mineral resources lying under the sea may be superior to those found in the earth. They also say that these can be removed without producing much 24 .………… . The extraction is often done by adapting the 25…………….. that has already been used to work on land, The method of excavation involves removing the seawater from the slurry that is brought up to ships and returning it to the seabed. However, concerned groups strongly believe that 26 ………….. is necessary due to the possible number of unidentified consequences. |
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