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有点多啊，辛苦各位了~~~~~
1、Although exposure to asbestos is the primary cause of mesothelioma, a slow-developing cancer, researchers believe that infection by the SV40 virus is a contributing cause, since in the United States 60 percent of tissue samples from mesotheliomas, but none from healthy tissue, contain SV40.SV40 is a monkey virus; however, in 1960 some polio vaccine was contaminated with the virus.Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later.
Which of the following, if true, most strongly supports the researchers’ hypothesis?
A.SV40 is widely used as a research tool in cancer laboratories.
B.Changes in the technique of manufacturing the vaccine now prevent contamination with SV40.
C.Recently discovered samples of the vaccine dating from 1960 still show traces of the virus.
D.In a small percentage of cases of mesothelioma, there is no history of exposure to asbestos.
E.In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40.
这个答案是E，头疼啊，那个Finland，在文章中都没出现啊，为什么不选C啊？
2、Yeasts capable of leavening bread are widespread, and in the many centuries during which the ancient Egyptians made only unleavened bread, such yeasts must frequently have been mixed into bread doughs accidentally.The Egyptians, however, did not discover leavened bread until about 3000 B.C.That discovery roughly coincided with the introduction of a wheat variety that was preferable to previous varieties because its edible kernel could be removed from the husk without first toasting the grain.
Which of the following, if true, provides the strongest evidence that the two developments were causally related?
A.Even after the ancient Egyptians discovered leavened bread and the techniques for reliably producing it were well known, unleavened bread continued to be widely consumed.
B.Only when the Egyptians stopped the practice of toasting grain were their stone-lined grain-toasting pits available for baking bread.
C.Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough.
D.The new variety of wheat, which had a more delicate flavor because it was not toasted, was reserved for the consumption of high officials when it first began to be grown.
E.Because the husk of the new variety of wheat was more easily removed, flour made from it required less effort to produce.
这个根本读不懂，求翻译，答案选C
3、
Which of the following most logically completes the argument below?
Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflections they produce.Because many of those large satellites have ceased to function, the proposal has recently been made to eliminate interference from nonfunctioning satellites by exploding them in space.This proposal, however, is ill conceived, since _______.
A.many nonfunctioning satellites remain in orbit for years
B.for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive
C.there are no known previous instances of satellites’ having been exploded on purpose
D.the only way to make telescope observations without any interference from debris in orbit is to use telescopes launched into extremely high orbits around the Earth
E.a greatly increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible
我觉得D和E都对，答案选E，迷茫~~~~~求解~~~~
Yeasts capable of leavening bread are widespread, and in the many centuries during which the ancient Egyptians made only unleavened bread, such yeasts must frequently have been mixed into bread doughs accidentally.The Egyptians, however, did not discover leavened bread until about 3000 B.C.That discovery roughly coincided with the introduction of a wheat variety that was preferable to previous varieties because its edible kernel could be removed from the husk without first toasting the grain.
Which of the following, if true, provides the strongest evidence that the two developments were causally related?
A.Even after the ancient Egyptians discovered leavened bread and the techniques for reliably producing it were well known, unleavened bread continued to be widely consumed.
B.Only when the Egyptians stopped the practice of toasting grain were their stone-lined grain-toasting pits available for baking bread.
C.Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough.
D.The new variety of wheat, which had a more delicate flavor because it was not toasted, was reserved for the consumption of high officials when it first began to be grown.
E.Because the husk of the new variety of wheat was more easily removed, flour made from it required less effort to produce.
这个根本读不懂，求翻译，答案选C
3、
Which of the following most logically completes the argument below?
Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflections they produce.Because many of those large satellites have ceased to function, the proposal has recently been made to eliminate interference from nonfunctioning satellites by exploding them in space.This proposal, however, is ill conceived, since _______.
A.many nonfunctioning satellites remain in orbit for years
B.for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive
C.there are no known previous instances of satellites’ having been exploded on purpose
D.the only way to make telescope observations without any interference from debris in orbit is to use telescopes launched into extremely high orbits around the Earth
E.a greatly increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible
我觉得D和E都对，答案选E，迷茫~~~~~求解~~~~ |
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发表于 2012-4-11 21:00:05
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