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1、阅读练习READING PASSAGE 1 You should spend about 20 minutes on Questions 113, which are based on Reading Passage 1 below. MAKING TIME FOR SCIENCE Chronobiology might sound a little futuristic like something from a science fiction novel, perhaps but its actually a field of study that concerns one of the
2、oldest processes life on this planet has ever known: short-term rhythms of time and their effect on flora and fauna. This can take many forms. Marine life, for example, is influenced by tidal patterns. Animals tend to be active or inactive depending on the position of the sun or moon. Numerous creat
3、ures, humans included, are largely diurnal that is, they like to come out during the hours of sunlight. Nocturnal animals, such as bats and possums, prefer to forage by night. A third group are known as crepuscular: they thrive in the lowlight of dawn and dusk and remain inactive at other hours. Whe
4、n it comes to humans, chronobiologists are interested in what is known as the circadian rhythm. This is the complete cycle our bodies are naturally geared to undergo within the passage of a twenty-four hour day. Aside from sleeping at night and waking during the day, each cycle involves many other f
5、actors such as changes in blood pressure and body temperature. Not everyone has an identical circadian rhythm. Night people, for example, often describe how they find it very hard to operate during the morning, but become alert and focused by evening. This is a benign variation within circadian rhyt
6、hms known as a chronotype. Scientists have limited abilities to create durable modifications of chronobiological demands. Recent therapeutic developments for humans such as artificial light machines and melatonin administration can reset our circadian rhythms, for example, but our bodies can tell th
7、e difference and health suffers when we breach these natural rhythms for extended periods of time. Plants appear no more malleable in this respect; studies demonstrate that vegetables grown in season and ripened on the tree are far higher in essential nutrients than those grown in greenhouses and ri
8、pened by laser. Knowledge of chronobiological patterns can have many pragmatic implications for our day-to-day lives. While contemporary living can sometimes appear to subjugate biology after all, who needs circadian rhythms when we have caffeine pills, energy drinks, shift work and cities that neve
9、r sleep? keeping in synch with our body clock is important. The average urban resident, for example, rouses at the eye-blearing time of 6.04 a.m., which researchers believe to be far too early. One study found that even rising at 7.00 a.m. has deleterious effects on health unless exercise is perform
10、ed for 30 minutes afterward. The optimum moment has been whittled down to 7.22 a.m.; muscle aches, headaches and moodiness were reported to be lowest by participants in the study who awoke then. Once youre up and ready to go, what then? If youre trying to shed some extra pounds, dieticians are adama
11、nt: never skip breakfast. This disorients your circadian rhythm and puts your body in starvation mode. The recommended course of action is to follow an intense workout with a carbohydrate-rich breakfast; the other way round and weight loss results are not as pronounced. Morning is also great for bre
12、aking out the vitamins. Supplement absorption by the body is not temporal-dependent, but naturopath Pam Stone notes that the extra boost at breakfast helps us get energised for the day ahead. For improved absorption, Stone suggests pairing supplements with a food in which they are soluble and steeri
13、ng clear of caffeinated beverages. Finally, Stone warns to take care with storage; high potency is best for absorption, and warmth and humidity are known to deplete the potency of a supplement. After-dinner espressos are becoming more of a tradition we have the Italians to thank for that but to prep
14、are for a good nights sleep we are better off putting the brakes on caffeine consumption as early as 3 p.m. With a seven hour half-life, a cup of coffee containing 90 mg of caffeine taken at this hour could still leave 45 mg of caffeine in your nervous system at ten oclock that evening. It is essent
15、ial that, by the time you are ready to sleep, your body is rid of all traces. Evenings are important for winding down before sleep; however, dietician Geraldine Georgeou warns that an after-five carbohydrate-fast is more cultural myth than chronobiological demand. This will deprive your body of vita
16、l energy needs. Overloading your gut could lead to indigestion, though. Our digestive tracts do not shut down for the night entirely, but their work slows to a crawl as our bodies prepare for sleep. Consuming a modest snack should be entirely sufficient. Questions 17 Do the following statements agre
17、e with the information given in Reading Passage 1? In boxes 17 on your answer sheet, write TRUE if the statement agrees with the information FALSE if the statement contradicts the information NOT GIVEN if there is no information on this 1 Chronobiology is the study of how living things have evolved
18、over time. 2 The rise and fall of sea levels affects how sea creatures behave. 3 Most animals are active during the daytime. 4 Circadian rhythms identify how we do different things on different days. 5 A night person can still have a healthy circadian rhythm. 6 New therapies can permanently change c
19、ircadian rhythms without causing harm. 7 Naturally-produced vegetables have more nutritional value. Questions 813 Choose the correct letter, A, B, C or D. Write the correct letter in boxes 813 on your answer sheet. 8 What did researchers identify as the ideal time to wake up in the morning? A 6.04 B
20、 7.00 C 7.22 D 7.30 9 In order to lose weight, we should A avoid eating breakfast B eat a low carbohydrate breakfast C exercise before breakfast D exercise after breakfast 10 Which is NOT mentioned as a way to improve supplement absorption? A avoiding drinks containing caffeine while taking suppleme
21、nts B taking supplements at breakfast C taking supplements with foods that can dissolve them D storing supplements in a cool, dry environment 11 The best time to stop drinking coffee is A mid-afternoon B 10 p.m. C only when feeling anxious D after dinner 12 In the evening, we should A stay away from
22、 carbohydrates B stop exercising C eat as much as possible D eat a light meal 13 Which of the following phrases best describes the main aim of Reading Passage 1? A to suggest healthier ways of eating, sleeping and exercising B to describe how modern life has made chronobiology largely irrelevant C t
23、o introduce chronobiology and describe some practical applications D to plan a daily schedule that can alter our natural chronobiological rhythms READING PASSAGE 2 You should spend about 20 minutes on Questions 1426, which are based on Reading Passage 2 below. The Triune1 Brain The first of our thre
24、e brains to evolve is what scientists call the reptilian cortex. This brain sustains the elementary activities of animal survival such as respiration, adequate rest and a beating heart. We are not required to consciously “think” about these activities. The reptilian cortex also houses the “startle c
25、entre”, a mechanism that facilitates swift reactions to unexpected occurrences in our surroundings. That panicked lurch you experience when a door slams shut somewhere in the house, or the heightened awareness you feel when a twig cracks in a nearby bush while out on an evening stroll are both examp
26、les of the reptilian cortex at work. When it comes to our interaction with others, the reptilian brain offers up only the most basic impulses: aggression, mating, and territorial defence. There is no great difference, in this sense, between a crocodile defending its spot along the river and a turf w
27、ar between two urban gangs. Although the lizard may stake a claim to its habitat, it exerts total indifference toward the well-being of its young. Listen to the anguished squeal of a dolphin separated from its pod or witness the sight of elephants mourning their dead, however, and it is clear that a
28、 new development is at play. Scientists have identified this as the limbic cortex. Unique to mammals, the limbic cortex impels creatures to nurture their offspring by delivering feelings of tenderness and warmth to the parent when children are nearby. These same sensations also cause mammals to deve
29、lop various types of social relations and kinship networks. When we are with others of “our kind” be it at soccer practice, church, school or a nightclub we experience positive sensations of togetherness, solidarity and comfort. If we spend too long away from these networks, then loneliness sets in
30、and encourages us to seek companionship. Only human capabilities extend far beyond the scope of these two cortexes. Humans eat, sleep and play, but we also speak, plot, rationalise and debate finer points of morality. Our unique abilities are the result of an expansive third brain the neocortex 1 Tr
31、iune = three-in-one which engages with logic, reason and ideas. The power of the neocortex comes from its ability to think beyond the present, concrete moment. While other mammals are mainly restricted to impulsive actions (although some, such as apes, can learn and remember simple lessons), humans
32、can think about the “big picture”. We can string together simple lessons (for example, an apple drops downwards from a tree; hurting others causes unhappiness) to develop complex theories of physical or social phenomena (such as the laws of gravity and a concern for human rights). The neocortex is a
33、lso responsible for the process by which we decide on and commit to particular courses of action. Strung together over time, these choices can accumulate into feats of progress unknown to other animals. Anticipating a better grade on the following mornings exam, a student can ignore the limbic urge
34、to socialise and go to sleep early instead. Over three years, this ongoing sacrifice translates into a first class degree and a scholarship to graduate school; over a lifetime, it can mean groundbreaking contributions to human knowledge and development. The ability to sacrifice our drive for immedia
35、te satisfaction in order to benefit later is a product of the neocortex. Understanding the triune brain can help us appreciate the different natures of brain damage and psychological disorders. The most devastating form of brain damage, for example, is a condition in which someone is understood to b
36、e brain dead. In this state a person appears merely unconscious sleeping, perhaps but this is illusory. Here, the reptilian brain is functioning on autopilot despite the permanent loss of other cortexes. Disturbances to the limbic cortex are registered in a different manner. Pups with limbic damage
37、can move around and feed themselves well enough but do not register the presence of their littermates. Scientists have observed how, after a limbic lobotomy2, “one impaired monkey stepped on his outraged peers as if treading on a log or a rock”. In our own species, limbic damage is closely related t
38、o sociopathic behaviour. Sociopaths in possession of fully-functioning neocortexes are often shrewd and emotionally intelligent people but lack any ability to relate to, empathise with or express concern for others. One of the neurological wonders of history occurred when a railway worker named Phin
39、eas Gage survived an incident during which a metal rod skewered his skull, taking a considerable amount of his neocortex with it. Though Gage continued to live and work as before, his fellow employees observed a shift in the equilibrium of his personality. Gages animal propensities were now sharply
40、pronounced while his intellectual abilities suffered; garrulous or obscene jokes replaced his once quick wit. New findings suggest, however, that Gage managed to soften these abrupt changes over time and rediscover an appropriate social manner. This would indicate that reparative therapy has the pot
41、ential to help patients with advanced brain trauma to gain an improved quality of life. 2 Lobotomy = surgical cutting of brain nerves Questions 1422 Classify the following as typical of A the reptilian cortex B the limbic cortex C the neocortex Write the correct letter, A, B or C, in boxes 1422 on y
42、our answer sheet. 14 giving up short-term happiness for future gains 15 maintaining the bodily functions necessary for life 16 experiencing the pain of losing another 17 forming communities and social groups 18 making a decision and carrying it out 19 guarding areas of land 20 developing explanation
43、s for things 21 looking after ones young 22 responding quickly to sudden movement and noise Questions 2326 Complete the sentences below. Write NO MORE THAN TWO WORDS from the passage for each answer. Write your answers in boxes 2326 on your answer sheet. 23 A person with only a functioning reptilian
44、 cortex is known as . 24 in humans is associated with limbic disruption. 25 An industrial accident caused Phineas Gage to lose part of his . 26 After his accident, co-workers noticed an imbalance between Gages and higher-order thinking. READING PASSAGE 3 You should spend about 20 minutes on Question
45、s 2740, which are based on Reading Passage 3 below. HELIUMS FUTURE UP IN THE AIR A In recent years we have all been exposed to dire media reports concerning the impending demise of global coal and oil reserves, but the depletion of another key nonrenewable resource continues without receiving much p
46、ress at all. Helium an inert, odourless, monatomic element known to lay people as the substance that makes balloons float and voices squeak when inhaled could be gone from this planet within a generation. B Helium itself is not rare; there is actually a plentiful supply of it in the cosmos. In fact,
47、 24 per cent of our galaxys elemental mass consists of helium, which makes it the second most abundant element in our universe. Because of its lightness, however, most helium vanished from our own planet many years ago. Consequently, only a miniscule proportion 0.00052%, to be exact remains in earth
48、s atmosphere. Helium is the byproduct of millennia of radioactive decay from the elements thorium and uranium. The helium is mostly trapped in subterranean natural gas bunkers and commercially extracted through a method known as fractional distillation. C The loss of helium on Earth would affect society greatly. Defying the perception of it as a novelty substance for parties and gimmicks, the element actually has many vital applications in society. Probably the most well known commercial usage is in airships and blimps (non-flammable helium replaced hydrogen as the lifting gas du jour after
