PART VREADING COMPREHENSION
In this section there are four passages followed by questions or unfinished statements, each withfour suggested answers marked A, B, C and D. Choose the one that you think is the best answer.
TEXT A
Racket, din clamor, noise, whatever you want to call it, unwanted sound is America's most widespread
nuisance. But noise is more than just a nuisance. It constitutes a real and present danger to people's health. Day
and night, at home, at work, and at play, noise can produce serious physical and psychological stress. No one is
immune to this stress. Though we seem to adjust to noise by ignoring it, the ear, in fact, never closes and the
body still responds— sometimes with extreme tension, as to a strange sound in the night.
The annoyance we feel when faced with noise is the most common outward symptom of the stress building
up inside us. Indeed, because irritability is so apparent, legislators have made public annoyance the basis of
many noise abatement programs. The more subtle and more serious health hazards associated with stress
caused by noise traditionally have been given much less attention. Nevertheless, when we are annoyed or made
irritable by noise, we should consider these symptoms fair warning that other thing may be happening to us,
some of which may be damaging to our health.
Of many health hazards to noise, hearing loss is the most clearly observable and measurable by health
professionals. The other hazards are harder to pin down. For many of us, there may be a risk that exposure to the
stress of noise increases susceptibility to disease and infection. The more susceptible among us may experience
noise as a complicating factor in heart problems and other diseases. Noise that causes annoyance and irritability
in health persons may have serious consequences for these already ill in mind or body.
Noise affects us throughout our lives. For example, there are indications of effects on the unborn child when
mothers are exposed to industrial and environmental noise. During infancy and childhood, youngsters exposed
to high noise levels may have trouble falling asleep and obtaining necessary amounts of rest.
Why, then, is there not greater alarm about these dangers? Perhaps it is because the link between noise and
many disabilities or diseases has not yet been conclusively demonstrated. Perhaps it is because we tend to
dismiss annoyance as a price to pay for living in the modern world. It may also be because we still think of
hearing loss as only an occupational hazard.
1.In Paragraph 1, the phrase "immune to" are used to mean ___.
A.unaffected by
B.hurt by
C.unlikely to be seen by
D.unknown by
2.The author's attitude toward noise would best be described as ___.
A.unrealistic
B.traditional
C.concerned
D.hysterical
3.Which of the following best states the main idea of the passage?
A.Noise is a major problem; most people recognize its importance.
B.Although noise can be annoying, it is not a major problem.
C.Noise is a major problem and has not yet been recognized as such.
D.Noise is a major problem about which nothing can be done.
4.The author condemns noise essentially because it ___.
A.is against the law
B.can make some people irritable
C.is a nuisance
D.in a ganger to people's health
5.The author would probably consider research about the effects noise has on people to be ___.
A.unimportant
B.impossible.
C.a waste of money
D.essential
ACCDD
暂无解析
I don’t like _____ bills but when I do get them I like _____ them promptly.
The school is going the ________ mile to create the next generation of sporting stars thanks to its unique development program.
Professor Johnson is said _____ some significant advance in his research in the past years.
As Gilbert White，Darwin ， and others observed long ago， all species appear to have theinnate capacity to increase their numbers from generation to generation. The task forecologistsis to untangle the environmentaand biologicalfactorsthat hold this intrinsiccapacity for population growth in check over the long run. The great variety of dynamicbehaviorsexhibitedby differentpopulationmakes thistaskmore difficult：sompopulations remain roughly constant from year to year; others exhibit regular cycles ofabundance and scarcity; still others vary wildly， with outbreaks and crashes that arein some cases plainly correlated with the weather， and in other cases not.To impose some order on this kaleidoscopeof patterns ， one school of thought proposesdividing populations into two groups. These ecologists posit that the relatively steadypopulations havedensity-dependent growth parameters; that is， rates ofbirth ， death ，and migrationwhich depend strongly on population density. The highly varying populationshave density-independent growth parameters， with vital rates buffeted by environmentalevents ;these rates fluctuate in a way that is wholly independent of population density.This dichotomy has its uses， but it can cause problems if taken too literally. Forone thing ， no population can be driven entirely by density-independent factors all thetime. No matter how severely or unpredictably birth， death ， and migration rates may befluctuatingaround theirlong-termaverages ， ifthere were no density-dependenteffects ，the populationwould ， in the long run ， eitherincrease or decrease without bound (barringa miracle by which gains and losses canceled exactly)。 Put another way， it may be thaton average 99 percent of all deaths in a populationarise from density-independentcauses ，and only one percent from factors varying with density.The factorsmaking up the one percentmay seem unimportant， and their cause may be correspondingly hard to determine. Yet，whether recognized or not， they will usually determine the long-term average populationdensity.In order to understand the nature of theecologist ’s investigation， we may think ofthe density-dependent effectson growth parameters as the signal ecologists are trying toisolateand interpret， one that tends to make the population increase from relativelylowvalues or decrease from relatively high ones， while the density-independent effects actto produce noise in the populationdynamics.For populationsthatremain relativelyconstant ， or that oscillate around repeated cycles， the signal can be fairly easilycharacterized and its effects described， even though the causative biological mechanismmay remain unknown. For irregularly fluctuating populations， we are likely to have toofew observations to have any hope of extracting the signal from the overwhelming noise.But it now seems clear that all populationsare regulatedby a mixture of density-dependentand density-independent effects in varying proportions.
1. The author of the text is primarily concerned with
[A] Discussing two categories of factorsthat controlpopulationgrowth and assessingtheir relative importance.
[B] Describinghow growth ratesin naturalpopulationsfluctuateover time andexplaining why these changes occur.
[C] Proposing a hypothesisconcerning population size and suggesting ways to test it.
[D] Posing a fundamental question about environmentalfactorsin populationgrowth andpresenting some currently accepted answer.
2. It can be inferred from the text that the author considers the dichotomy discussedto be
[A] Applicable only to erratically fluctuating populations.
[B] instrumental， but only if its limitations are recognized.
[C] Dangerously misleading in most circumstances.
[D] A complete and sufficient way to account for observed phenomena.
3.to the text ， allof the followingbehaviors have been exhibitedby differentpopulations EXCEPT
[A] Roughly constant population levels from year to year.
[B] Regular cycles of increases and decreases in numbers.
[C] Erratic increases in numbers correlated with the weather.
[D] Unchecked increases in numbers over many generations.
4. The discussion concerning population in the third paragraph serves primarily to
[A] Demonstrate the difficultiesecologistsface in studying density-dependentfactorslimiting population growth.
[B] Advocate more rigorous study of density-dependent factors in population growth.
[C] Prove that the death rates of any populationare never entirelydensity-independent.
[D] underline the importance of even small density-dependent factors in regulatinglong-term population densities.
5. In the text， the author does all of the following EXCEPT
[A] Cite the views of other biologists.
[B] Define a basic problem that the text addresses.
[C] Present conceptual categories used by other biologists.
[D] Describe the results of a particular study.
If your car _____ any attention during the first 12 months, take it to authorized dealer.
