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100.(30745-!-item-!-188;#058&005748)(T-9-Q28. ???-7-13 , different type)
Lyme disease is caused by a bacterium transmitted to humans by deer ticks.Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice.However, certain other species on which the larvae feed do not harbor the bacterium.If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.
Which of the following would it be most important to ascertain in evaluating the argument?
A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice
B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on
C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice
D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed
E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans
112.(29286-!-item-!-188;#058&003696)(GWD 26-Q31)
(29286-!-item-!-188;#058&003696)(GWD 26-Q31)
Which of the following most logically completes the argument?
When people engage in activities that help others, their brain releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being.It has been suggested that regular release of endorphins increases people’s longevity, and a statistic on adults who regularly engage in volunteer work helping others shows that they live longer, on average, than adults who do not volunteer.However, that statistic would be what we would expect even if volunteering does not boost longevity, because __________.
A. in the communities studied, women were much more likely to do regular volunteer work than men were, and women tend to live longer than men do
B. the number of young adults who do regular volunteer work is on the increase
C. the feelings of well-being induced by endorphins can, at least for a time, mask the symptoms of various conditions and diseases, provided the symptoms are mild
D. it is rare for a person to keep up a regular schedule of volunteer work throughout his or her life
D. it is rare for a person to keep up a regular schedule of volunteer work throughout his or her life
E. some people find that keeping a commitment to do regular volunteer work becomes a source of stress in their lives
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发表于 2011-11-11 19:20:00
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