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試題分類：
專業(yè)英語八級(jí)
練習(xí)次數(shù)：20次
Recent research has claimed that an excess of positive ions in the air can have an ill effect on people’s physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particles,
and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes
when winds such as the Mistral, Hamsin or Sharav are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or
computer display screens.
When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches, fatigue, irritability, and some sensitive people suffer nausea or even mental disturbance. Animals
are also affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a
network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California.
Conversely, when large numbers of negative ions are present, then people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with tumbling streams or waterfalls.
To increase the supply of negative ions indoors, some scientists recommend the use of ionisers: small portable machines, which generate negative ions. They claim that ionisers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions. Of course, there are the detractors, other scientists, who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own minds by observing the effects on themselves, or on others, of a negative rich or poor environment. After all it is debatable whether depending on seismic readings to anticipate earthquakes is more effective than watching the cat.
1.What effect does exceeding positive ionization have on some people?
A.They think they are insane.
B.They feel rather bad-tempered and short-fussed.
C.They become violently sick.
D.They are too tired to do anything.
2.In accordance with the passage, static electricity can be caused by___.
A.using home-made electrical goods.
B.wearing clothes made of natural materials.
C.walking on artificial floor coverings.
D.copying TV programs on a computer.
3.A high negative ion count is likely to be found___.
A.near a pound with a water pump.
B.close to a slow-flowing river.
C.high in some barren mountains.
D.by a rotating water sprinkler.
4.What kind of machine can generate negative ions indoors?
A.Ionisers.
B.Air-conditioners.
C.Exhaust-fans
D.Vacuum pumps.
5.Some scientists believe that___.
A.watching animals to anticipate earthquakes is more effective than depending
on seismography.
B.the unusual behavior of animals cannot be trusted.
C.neither watching nor using seismographs is reliable.
D.earthquake
試題分類：
大學(xué)英語六級(jí)
練習(xí)次數(shù)：2次
試題分類：
安全員
練習(xí)次數(shù)：0次
試題分類：
專業(yè)英語八級(jí)
練習(xí)次數(shù)：1次
試題分類：
專業(yè)英語八級(jí)
練習(xí)次數(shù)：1次
試題分類：
安全員
練習(xí)次數(shù)：0次
Roger Rosenblatt ’s book Black Fiction,in attemptingto apply
literaryratherthansociopolitical criteria to its subject, successfully alters
the approach taken by mostprevious studies. As Rosenblatt notes, criticism of
Black writing has often served as apretextfor expounding on Black
history.Addison Gayle’s recent work, for example, judgesthe value of Black
fiction by overtly political standards, rating each work according tothe notions
of Black identity which it propounds.Although fictionassuredly springs from
politicalcircumstances ，its authors react tothose circumstances in ways other
than ideological, and talking about novels and storiesprimarilyas instrumentsof
ideologycircumvents much of the fictional enterprise.Rosenblatt ’s
literaryanalysisdisclosesaffinitiesand connections among works of Blackfiction
which solely political studies have overlooked or ignored. Writing acceptable
criticism ofBlack fiction, however, presupposes giving satisfactory answers to a
number of questions.First of all, is there a sufficient reason, other than the
facial identity of the authors, to group together works by Black authorsSecond,
how does Black fiction make itself distinct from other modern fiction with which
it islargely contemporaneous Rosenblatt shows that Black fiction constitutes a
distinct bodyof writingthat has an identifiable， coherent
literarytradition.Looking at novels writtenby Black over the last eighty years,
he discovers recurringconcerns and designs independentof chronology. These
structures are thematic, and they spring, not surprisingly, from thecentralfact
that the Black charactersin these novels exist in a predominantlywhite
culture,whether they try to conform to that culture or rebel against it.Black
Fictiondoes leave some aestheticquestions open. Rosenblatt ’s thematic
analysispermits considerable objectivity; he even explicitly states that it is
not his intentionto judge the merit of the various works D yet his reluctance
seems misplaced, especiallysince an attempt to appraise might have led to
interesting results. For instance, some ofthe novels appear to be
structurallydiffuse.Is this a defect,or are the authors workingout of, or trying
to forge, a different kind of aesthetic In addition, the style of someBlack
novels, like JeanToomey’s Cane, verges on expressionism or surrealism; does
thistechnique provide a counterpointto the prevalenttheme that portrays the fate
against whichBlack heroes are pitted,a theme usuallyconveyed by more
naturalisticmodes of expressionIn spite of such omissions, what Rosenblatt does
include in his discussion makes foran astute and worthwhile study. Black Fiction
surveys a wide variety of novels, bringingto our attention in the process some
fascinating and little-known works like James WeldonJohnson’s Autobiography of
an Ex-Colored Man. Its argument is tightly constructed, andits forthright, lucid
style exemplifies levelheaded and penetrating criticism.
1. The author of the text is primarily concerned with __________.
[A] Evaluating the soundness of a work of criticism.[B] Comparing various
critical approaches to a subject.
[C] Discussing the limitations of a particular kind of criticism.
[D] Summarizing the major points made in a work of criticism.
2. The author of the text believes that Black Fiction would have been
improved hadRosenblatt __________.
[A] Evaluated more carefully the ideological andhistoricalaspects of Black
fiction.
[B] Attempted to be more objective in his approach to novels and stories by
Blackauthors.
[C] Explorein greaterdetailthe recurrentthematicconcerns of Black
fictionthroughout its history.
[D] Assessed the relative literary merit of the novels he analyzes
thematically.
3.author ’s discussion of Black Fiction can be best described as
__________.
[A] Pedantic and contentious.
[B] Critical but admiring.
[C] Ironic and deprecating.
[D] Argumentative but unfocused.author of the text employs all of the
following in the discussion ofRosenblatt ’s
4.book EXCEPT： __________.
[A] Rhetorical questions.
[B] Specific examples.
[C] Comparison and contrast.
[D] Definition of terms.
5. The author of the text refers to James WeldonJohnson’s Autobiography of
anEx-Colored Man most probably in order to __________.
[A] point out affinitiesbetween Rosenblatt ’s method of thematic analysis and
earliercriticism.
[B] Clarify the point about expressionistic style made earlier in the
passage.
[C] Qualify the assessment ofRosenblatt ’s book made in the first paragraph
of thepassage.
[D] give a specific example of one of the accomplishments ofRosenblatt ’s
work.
試題分類：
專業(yè)英語八級(jí)
練習(xí)次數(shù)：21次
試題分類：
安全員
練習(xí)次數(shù)：0次
試題分類：
資料員
練習(xí)次數(shù)：0次
Scattered through the seas of the world are billions of tons of small plants
and animals called plankton. Most of these plants and animals are too small for
the human eye to see. They drift about lazily with the currents, providing a
basic food for many larger animals. Plankton has been described as the
equivalent of the grasses that grow on the dry land continents, and the
comparison is an appropriate one. In potential food value however, plankton far
outweighs that of the land grasses. One scientist has estimated that while
grasses of the world produce about 49 billion tons of valuable carbohydrates
each year. The sea’s plankton generates more than twice as much.
Despite its enormous food potential, little effort was made until recently to
farm plankton as we farm grasses on land. Now marine scientists have at last
begun to study this possibility, especially as the sea’s resources loom even
more important as a means of feeding an expanding world population.
No one yet has seriously suggested that “planktonburgers” may soon become
popular around the world. As a possible farmed supplementary food source,
however, plankton is gaining considerable interest among marine scientists.
One type of plankton that seems to have great harvest possibilities is a tiny
shrimplike creature called krill. Growing to two or three inches long, krill
provide the major food for the giant blue whale, the largest animal ever to
inhabit the Earth. Realizing that this whale may grow 100 feet and weigh 150
tons at maturity, it is not surprising that each one devours more than one ton
of krill daily.
Krill swim about just below the surface in huge schools sometimes miles wide,
mainly in the cold Antarctic. Because of their pink color, they often appear as
a solid reddish mass when viewed from a ship or from the air. Krill are very
high in food value. A pound of these crustaceans contains about 460
calories—about the same as shrimp or lobster, to which they are related.
If the krill can feed such huge creatures as whales, many scientists reason,
they must certainly be contenders as new food source for humans.
1.Which of the following best portrays the organization of the passage?
A.The author presents the advantages and disadvantages of plankton as a food
source.
B.The author quotes public opinion to support the argument for farming
plankton.
C.The author classifies the different food sources according to amount of
carbohydrate.
D.The author makes a general statement about plankton as a food source and
then moves to a specific example.
2.According to the passage, why is plankton regarded to be more valuable than
land grasses?
A.It is easier to cultivate.
B.It produces more carbohydrates.
C.It does not require soil.
D.It is more palatable.
3.Why does the author mention “planktonburgers”?
A.To describe the appearance of one type of plankton.
B.To illustrate how much plankton a whale consumes.
C.To suggest plankton as a possible food sources.
D.To compare the food values of beef and plankton.
4.What is mentioned as one conspicuous feature of krill?
A.They are the smallest marine animals.
B.They are pink in color.
C.They are similar in size to lobsters.
D.They have grass like bodies.
5.The author mentions all of the following as reasons why plankton could be
considered a human food source except that it is ___.
A.high in food value.
B.in abundant supply in the oceans.
C.an appropriate food for other animals.
D.free of chemicals and pollutants.
試題分類：
大學(xué)英語六級(jí)
練習(xí)次數(shù)：1次
