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发表于 2005-9-26 11:58:40
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NO6-3-4
Mycorrhizal fungi infect more plants than do any
other fungi and are necessary for many plants to thrive,
but they have escaped widespread investigation until
recently for two reasons. First, the symbiotic associa-
tion is so well-balanced that the roots of host plants
show no damage even when densely infected. Second,
the fungi cannot as yet be cultivated in the absence of a
living root. Despite these difficulties, there has been
important new work that suggests that this symbiotic
association can be harnessed to achieve more economi-
cal use of costly superphosphate fertilizer and to permit
better exploitation of cheaper, less soluble rock phos-
phate. Mycorrhizal benefits are not limited to improved
phosphate uptake in host plants. In legumes, mycor-
rhizal inoculation has increased nitrogen fixation
beyond levels achieved by adding phosphate fertilizer
alone. Certain symbiotic associations also increase the
host plant’s resistance to harmful root fungi. Whether
this resistance results from exclusion of harmful fungi
through competition for sites, from metabolic change
involving antibiotic production, or from increased vigor
is undetermined.
17. Which of the following most accurately describes
the passage?
(A) A description of a replicable experiment
(B) A summary report of new findings
(C) A recommendation for abandoning a difficult
area of research
(D) A refutation of an earlier hypothesis
(E) A confirmation of earlier research
18. The level of information in the passage above is
suited to the needs of all of the following people
EXCEPT
(A) a researcher whose job is to identify potentially
profitable areas for research and product
development
(B) a state official whose position requires her to
alert farmers about possible innovations in
farming
(C) an official of a research foundation who identi-
fies research projects for potential funding
(D) a biologist attempting to keep up with scien-
tific developments in an area outside of his
immediate area of specialization
(E) a botanist conducting experiments to deter-
mine the relationship between degree of
mycorrhizal infection and expected uptake
of phosphate
19. It can be inferred from the passage that which of
the following has been a factor influencing the
extent to which research on mycorrhizal fungi has
progressed?
(A) Lack of funding for such research
(B) Lack of immediate application of such research
(C) Lack of a method for identifying mycorrhizal
fungi
(D) Difficulties surrounding laboratory production
of specimens for study
(E) Difficulties ensuing from the high cost and
scarcity of superphosphate fertilizers
20. The passage suggests which of the following about
the increased resistance to harmful root fungi that
some plants infected with mycorrhizal fungi seem to
exhibit?
(A) There are at least three hypotheses that might
account for the increase.
(B) An explanation lies in the fact that mycorrhizal
fungi increase more rapidly in number than
harmful root fungi do.
(C) The plants that show increased resistance also
exhibit improved nitrogen fixation.
(D) Such increases may be independent of mycor-
rhizal infection.
(E) It is unlikely that a satisfactory explanation
can be found to account for the increase.
In the early 1950’s, historians who studied pre
industrial Europe (which we may define here as
Europe in the period from roughly 1300 to 1800)
began, for the first time in large numbers, to inves-
(5) tigate more of the preindustrial European popula-
tion than the 2 or 3 percent who comprised the
political and social elite: the kings, generals, judges,
nobles, bishops, and local magnates who had hith-
erto usually filled history books. One difficulty,
(10) however, was that few of the remaining 97 percent
recorded their thoughts or had them chronicled by
contemporaries. Faced with this situation, many
historians based their investigations on the only
records that seemed to exist: birth, marriage, and
(15) death records. As a result, much of the early work
on the nonelite was aridly statistical in nature;
reducing the vast majority of the population to a
set of numbers was hardly more enlightening than
ignoring them altogether. Historians still did not
(20) know what these people thought or felt.
One way out of this dilemma was to turn to the
records of legal courts, for here the voices of the
nonelite can most often be heard, as witnesses,
plaintiffs, and defendants. These documents have
(25) acted as “a point of entry into the mental world of
the poor.” Historians such as Le Roy Ladurie have
used the documents to extract case histories, which
have illuminated the attitudes of different social
groups (these attitudes include, but are not confined
(30) to, attitudes toward crime and the law) and have
revealed how the authorities administered justice. It
has been societies that have had a developed police
system and practiced Roman law, with its written
depositions, whose court records have yielded the
(35) most data to historians. In Anglo-Saxon countries
hardly any of these benefits obtain, but it has still
been possible to glean information from the study
of legal documents.
The extraction of case histories is not, however,
(40) the only use to which court records may be put.
Historians who study preindustrial Europe have
used the records to establish a series of categories of
crime and to quantify indictments that were issued
over a given number of years. This use of the
(45) records does yield some information about the
nonelite, but this information gives us little insight
into the mental lives of the nonelite. We also know
that the number of indictments in preindustrial
Europe bears little relation to the number of actual
(50) criminal acts, and we strongly suspect that the rela-
tionship has varied widely over time. In addition,
aggregate population estimates are very shaky,
which makes it difficult for historians to compare
rates of crime per thousand in one decade of the
(55) preindustrial period with rates in another decade.
Given these inadequacies, it is clear why the case
history use of court records is to be preferred.
21. The author suggests that, before the early 1950’s,
most historians who studied preindustrial Europe did
which of the following?
(A) Failed to make distinctions among members of
the preindustrial European political and social
elite.
(B) Used investigatory methods that were almost
exclusively statistical in nature.
(C) Inaccurately estimated the influence of the
preindustrial European political and social
elite.
(D) Confined their work to a narrow range of the
preindustrial European population.
(E) Tended to rely heavily on birth, marriage, and
death records.
22. According to the passage, the case histories extracted
by historians have
(A) scarcely illuminated the attitudes of the political
and social elite
(B) indicated the manner in which those in power
apportioned justice
(C) focused almost entirely on the thoughts and feel-
ings of different social groups toward crime and
the law
(D) been considered the first kind of historical writ-ing
that utilized the records of legal courts
(E) been based for the most part on the trial testi-
mony of police and other legal authorities
23. It can be inferred from the passage that much of the
early work by historians on the European nonelite of
the preindustrial period might have been more illu-
minating if these historians had
(A) used different methods of statistical analysis to
investigate the nonelite
(B) been more successful in identifying the attitudes of
civil authorities, especially those who
administered justice, toward the nonelite
(C) been able to draw on more accounts, written by
contemporaries of the nonelite, that described
what this nonelite thought
(D) relied more heavily on the personal records left
by members of the European political and
social elite who lived during the period in
question
(E) been more willing to base their research on the
birth, marriage, and death records of the
nonelite
24. The author mentions Le Roy Ladurie (line 26) in
order to
(A) give an example of a historian who has made
one kind of use of court records
(B) cite a historian who has based case histories on
the birth, marriage, and death records of the
nonelite
(C) identify the author of the quotation cited in the
previous sentence
(D) gain authoritative support for the view that the
case history approach is the most fruitful
approach to court records
(E) point out the first historian to realize the value of
court records in illuminating the beliefs
and values of the nonelite
25. According to the passage, which of the following is
true of indictments for crime in Europe in the pre-
industrial period?
(A) They have, in terms of their numbers, remained
relatively constant over time.
(B) They give the historian important information
about the mental lives of those indicted.
(C) They are not a particularly accurate indication
of the extent of actual criminal activity.
(D) Their importance to historians of the nonelite
has been generally overestimated.
(E) Their problematic relationship to actual crime
has not been acknowledged by most his-
torians.
26. It can be inferred from the passage that a historian
who wished to compare crime rates per thousand in
a European city in one decade of the fifteenth cen-
tury with crime rates in another decade of that cen-
tury would probably be most aided by better infor-
mation about which of the following?
(A) The causes of unrest in the city during the two
decades
(B) The aggregate number of indictments in the
city nearest to the city under investigation
during the two decades
(C) The number of people who lived in the city
during each of the decades under investiga-
tion
(D) The mental attitudes of criminals in the city,
including their feelings about authority, dur-
ing each of the decades under investigation
(E) The possibilities for a member of the city’s
nonelite to become a member of the political
and social elite during the two decades
27. The passage would be most likely to appear as
part of
(A) a book review summarizing the achievements
of historians of the European aristocracy
(B) an essay describing trends in the practice of
writing history
(C) a textbook on the application of statistical
methods in the social sciences
(D) a report to the historical profession on the
work of early-twentieth-century historians
(E) an article urging the adoption of historical
methods by the legal profession |
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