to plan环球雅思学校入学测试题（A）
READING橡实>祈使句英语
READING PASSAGE 1
polyester什么意思You should spend about 20 minutes on Question 1-13, which are bad on Reading Passage 1 below:
Reading passage 1 has eight ctions A-H.
Choo the correct heading for A-G from the list of headings below.
LIST OF HEADINGS
i ii iii iv v vi vii viii ix x xi xii | Rearch on earphones harm Beyond comfortable of hearing The maximum noi level of the 'Walkman' Harmful noi pollution Noi everywhere Reasons for harm The maximum safe noi dosage spring festival英语作文The cur of silence A cure for 'tinnitus' Alarming statistical evidence A chronic hearing loss impairment The danger of falling asleep |
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1. Section A iv
2.锤子英文Section B v
3.Section C xi
4.Section D vii
5.Section E iii goodwill
flagship6.Section F xii
7.Section G asts ix烦劳
Example Section H viii
A It is by old saying that the virtue of silence by claiming it is golden, yet experience tells us that silence is as hard to come by as the precious metal itlf. The benefit of silence to the human ear is scientifically demonstrable. Less superfluous noi; less impairment to t
he hearing. Yet this precious commodity is no longer valued. Noi is ever prent in modern life and is an accumulative experience. The ill effects of noi pollution are of two kinds: acute -- exposure to an individual instance of a very loud noi, such as a gunshot or explosion; and chronic -- the experience of too much noi over an extended period of time.
B City and urban dwellers exist in an increasingly noi-ridden environment, and it is now almost impossible to escape exposure to high noi levels. Even if we exclude the more obvious sources of noi pollution such as jet plane engines, road works, power tools, loud music at dance parties and so on, it is clear that noi is a constant and often unwelcome companion. We have only to walk through a suburban shopping mall or department store, or catch a bus or train to be subjected to noi levels that a few decades ago would have been considered beyond human endurance. The popular practice of 'layering' sound, by adding a louder source of noi to that which already exists in order to mask it, merely compounds the problem. Becau of the accumulative nature of noi abu, constant noi is wor than noisy periods intersperd with silen
ce.
C Our noi level acceptance threshold is rising in step with the number of persons developing hearing problems. Data available from a recent survey conducted by the Australian Bureau of Statistics show that 7.4% of people over 14 years of age have some discernible hearing problem. According to the survey, 24.6% of the 7.4% of persons with affected hearing have problems caud by subjection to a constant barrage of noi, either at work, in the everyday living environment, or as the result of a particular choice of leisure activity. The problem is most vere for males aged between 25 and 64 years of age, 9.1%of whom have a hearing disability, and for which the cau is constant noi in 44.4% of cas.
D Of current concern to acoustical engineers and psychologists at the National Acoustics Laboratories in Sydney, Australia, is the potential for damage to the eardrum caud by the transmission of loud sound through earphones placed directly into the ear canal. An almost universal fad among young people, the pocket-sized radio-castte player (comm
only known by the brand name 'Walkman') may be exposing its owner to greater than the maximum safe dosage of noi recommended for industrial workers - 90 decibels* over a period of 8 hours. This dosage, called Do 1, can be achieved much sooner by exposing the ear to only slightly more than 90 decibels. Increas to the decibel level logarithmically shorten the exposure time required to reach a given do. For instance, to achieve Do 1 in 4 hours, it is necessary to rai the decibel exposure level by a mere 3 decibels.
E One danger pod to young ears is that the peak sound level from the radio-castte players is often far too great; at high volume it is all too easy to receive Do 1 in a short period of time. Any further noi heard above 90 decibels that day and the recipient is causing measurable damage to his or her ears. Another danger is the likelihood of a change in the pain threshold of noi resulting in urs compensating by increasing the volume to levels way above what is considered safe. Finally, inrtable earphones block the ear canal, thereby further increasing the noi level absorbed.
F But perhaps the most alarming potential for danger caud by inrtable earphones is the ea with which the listener can exceed the safe time length of exposure to noi. The small earphones can be comfortably worn for extended periods of time. What is more, there is the danger of falling asleep with the earphones inrted, leading to an accumulation of excess noi while unconscious.
G Noi abu soon leads to varying degrees of hearing loss. What may begin as an acute temporary condition, in time becomes a chronic and irreversible disability. A common complaint is 'tinnitus', or a 'ringing in the ears' which fails to subside after the ears are subjected to a short but extreme do of noi. It is an exhausting condition that can riously threaten the composure of the sufferer who can be driven to near madness. It is believed the compor Beethoven was particularly aggravated by this malady. At prent, there is little that can be done in the majority of cas, although the victim might be able to obtain some temporary relief by using am asking device which blocks out the offending frequencies of sound with other, less annoying frequencies.
H Inevitably, though, years of excessive noi accumulation take their toll and partial or complete deafness results. If silence is the cure for ailing ears (or, at least, the best way to prevent further deterioration of one's hearing), it is sobering to reali that it is also the unfortunate and permanent cur of a lifetime of noi abu caud by ignoring the warnings.
