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请教几道阅读题，大家帮我看看？
252
Although genetic mutations in bacteria and viruses
can lead to epidemics, some epidemics are caused by
bacteria and viruses that have undergone no significant
genetic change. In analyzing the latter, scientists have
(5) discovered the importance of social and ecological fac-
tors to epidemics. Poliomyelitis, for example, emerged
as an epidemic in the United States in the twentieth
century; by then, modern sanitation was able to delay
exposure to polio until adolescence or adulthood, at
(10) which time polio infection produced paralysis. Previ-
ously, infection had occurred during infancy, when it
typically provided lifelong immunity without paralysis.
Thus, the hygiene that helped prevent typhoid epidemics
indirectly fostered a paralytic polio epidemic. Another
(15) example is Lyme disease, which is caused by bacteria
that are transmitted by deer ticks. It occurred only spo-
radically during the late nineteenth century but has
recently become prevalent in parts of the United States,
largely due to an increase in the deer population that
(20) occurred simultaneously with the growth of the suburbs
and increased outdoor recreational activities in the
deer’s habitat. Similarly, an outbreak of dengue hemor-
rhagic fever became an epidemic in Asia in the 1950’s
because of ecological changes that caused Aedes aegypti,
(25) the mosquito that transmits the dengue virus, to proliferate
The stage is now set in the United States for a
dengue epidemic because of the inadvertent introduction
and wide dissemination of another mosquito, Aedes
albopictus.
124. Which of the following, if true, would most strengthen
the author’s assertion about the cause of the Lyme
disease outbreak in the United States?
(A) The deer population was smaller in the late
nineteenth century than in the mid-twentieth century.
(B) Interest in outdoor recreation began to grow in the
late nineteenth century.
(C) In recent years the suburbs have stopped growing.
(D) Outdoor recreation enthusiasts routinely take
measures to protect themselves against Lyme
disease.
(E) Scientists have not yet developed a vaccine that can
prevent Lyme disease.
answer：A ，B和D为什么不对？
－－－－－－－－－－－－－－－－
Historians of women’s labor in the United States at first
largely disregarded the story of female service workers
-women earning wages in occupations such as salesclerk.
domestic servant, and office secretary. These historians
(5) focused instead on factory work, primarily because it
seemed so different from traditional, unpaid “women’s
work” in the home, and because the underlying economic
forces of industrialism were presumed to be gender-blind
and hence emancipatory in effect. Unfortunately, emanci-
(10) pation has been less profound than expected, for not even
industrial wage labor has escaped continued sex segre-
gation in the workplace.
To explain this unfinished revolution in the status of
women, historians have recently begun to emphasize the
( 15) way a prevailing definition of femininity often etermines
the kinds of work allocated to women, even when such
allocation is inappropriate to new conditions. For instance,
early textile-mill entrepreneurs, in justifying women’s
employment in wage labor, made much of the assumption
(20) that women were by nature skillful at detailed tasks and
patient in carrying out repetitive chores; the mill owners
thus imported into the new industrial order hoary stereo-
types associated with the homemaking activities they
presumed to have been the purview of women. Because
(25)women accepted the more unattractive new industrial tasks
more readily than did men, such jobs came to be regarded
as female jobs.And employers, who assumed that women’s
“real” aspirations were for marriage and family life.
declined to pay women wages commensurate with those of
(30) men. Thus many lower-skilled, lower-paid, less secure jobs
came to be perceived as “female.”
More remarkable than the origin has been the persistence
of such sex segregation in twentieth-century industry. Once
an occupation came to be perceived as “female.” employers
(35) showed surprisingly little interest in changing that percep-
-tion, even when higher profits beckoned. And despite the
urgent need of the United States during the Second World War
to mobilize its human resources fully, job segregation by sex
characterized even the most important
(40) war industries. Moreover, once the war ended, employers
quickly returned to men most of the “male” jobs that
women had been permitted to master.
画线的句子是有否定的概念吗？ 因为这里考了一道题，但我觉得我是对这句话理解有误造成的！
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发表于 2003-11-13 13:35:00
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