题目内容
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According to the passage, the primary use of the apparatus would be to______.
A．increase the mass of a neutrino
B．interpret the information neutrinos carry with them
C．study the internal structure of a neutrino
D．detect the presence of cosmic neutrinos
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更多“According to the passage, the …”相关的问题
第1题
the detection of photons—quanta of electromagnetic radiation. Yet mere is another form. of radiation that permeates the universe: neutrinos. With(as its name implies)no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Furthermore, neutrinos carry with them information about the site and circumstances of their production: therefore, the detection of cosmic neutrinos could provide new information about a wide variety of cosmic phenomena and about the history of the universe. But how can scientists detect a particle that interacts so infrequently with other matter? Twenty-five years passed between Paulis hypothesis that the neutrino existed and its actual detection: since then virtually all research with neutrinos has been with neutrinos created artificially in large particle accelerators and studied under neutrino microscopes. But a neutrino telescope, capable of detecting cosmic neutrinos, is difficult to construct. No apparatus can detect neutrinos unless it is extremely massive, because great mass is synonymous with huge numbers of nucleons(neutrons and protons), and the more massive the detector, the greater the probability of one of its nucleons reacting with a neutrino. In addition, the apparatus must be sufficiently shielded from the interfering effects of other particles. Fortunately, a group of astrophysicists has proposed a means of detecting cosmic neutrinos by harnessing the mass of the ocean. Named DUMAND, for Deep Underwater Muon and Neutrino Detector, the project calls for placing an array of light sensors at a depth of five kilometers under the ocean surface. The detecting medium is the seawater itself: when a neutrino interacts with a particle in an atom of seawater, the result is a cascade of electrically charged particles and a flash of light that can be detected by the sensors. The five kilometers of seawater above the sensors will shield them from the interfering effects of other high-energy particles raining down through the atmosphere. The strongest motivation for the DUMAND project is that it will exploit an important source of information about the universe. The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars. Each of these discoveries came as a surprise. Neutrino astronomy will doubtless bring its own share of surprises.
Which of the following titles best summarizes the passage as a whole?
A．At the Threshold of Neutrino Astronomy
B．Neutrinos and the History of the Universe
C．The Creation and Study of Neutrinos
D．The DUMAND System and How It Works
第2题
ice age occurred about 25, 000 years ago. II. Ice ages have lasted about 10, 000 years for at least the last several hundred thousand years. III. Ice ages have occurred about every 100, 000 years for at least the last several hundred thousand years.
A．I only
B．II only
C．III only
D．I , II and III
第3题
uld be the case?
A．The equipment used in Japanese automobile plants would be different from the equipment used in United States plants.
B．Japanese workers would be trained to do several different production jobs.
C．Culture would not have an influence on the productivity levels of workers.
D．The production levels of Japanese-run plants located in the United States would be equal to those of plants run by United States companies.
第4题
经学家的血液，融人了文法家的方方面面。目前以“语言学”之名从事的大多数工作纯粹是描述性的；语言学家试图不通过价值判断或尝试绘制出未来语言发展的方向就来澄清语言的本质。但是，有许多专业人士和业余爱好者也在制定语言规则，他们规定出专门标准让大家遵守。而规定语法学家(prescriptivist)可能是想勾画出他们猜想什么是所谓的“错误的用法”，描写语言学家(descriptivist)却试图找到这种用法的根源；他们可能仅仅把它描述为“特殊的”，或者可能想找到规定语法学家不喜欢的规律性。规定语法学家之所以不喜欢这些规律，要么是因为它们太新，要么是因为它们源自一种他们不认可的方言。20世纪下半叶，规定性语法的传统受到越来越激烈的批评，这可以从他们反对的调子越来越微弱得到证明，但规定性语法的传统还远远没有消亡。
第5题
e in decades. Credit goes largely【C2】______the 1, 000 automated radar cameras planted on the nations highways since 2003, which experts reckon【C3】______3,000 lives last year. Success, of course breeds success: the government plants to install 500【C4】______radar devices this year. So it goes with surveillance these days. Europeans used to look at the security cameras posted in British cities, subways and buses【C5】______the seeds of an Orwellian world that was largely unacceptable in Continental Europe. But last years London bombing, in which video cameras【C6】______a key role in identifying the perpetrators, have helped spur a sea change. A month【C7】______the London attacks, half of Germans supported EU-wide plans to require Internet providers and telecoms to store all e-mail, Internet and phone data for "anti-terror"【C8】______. In a British poll, 73 percent of respondents said they were【C9】______to give up some civil liberty to improve【C10】______.
【C1】
第6题
Maine RX mentioned in Paragraph 2 is a______.
A．bill
B．drug company
C．customs office
D．seniors society
第7题
From the context, "medium" is used in the last sentence refers to______.
A．studios and companies
B．mass entertainment
C．films
D．the pursuit of fan and relaxation
第8题
had been abandoned several years earlier by a sewing machine manufacturer.
A．run-off
B．run-down
C．run-about
D．run-away
第9题
paychecks______more than 40% since 1982.
A．burned
B．broken
C．polluted
D．eroded
第10题
fe in My Mind".
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