[考研类试卷]考研英语二(完形填空)模拟试卷68及答案与解析.doc
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1、考研英语二(完形填空)模拟试卷 68 及答案与解析一、Section I Use of EnglishDirections: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D. (10 points) 0 Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has achieved a new breakthrough, with U
2、K scientists reporting transmission speeds of 10Gbit/smore than 250 times faster than superfast broadband. The fastest speed【C1 】 _reported was 3Gbit/s, achieved earlier this year in Germany. Chinese researchers also claimed this month to have【 C2】_a 150Mbp/s connection, but some experts were doubtf
3、ul without seeing further【C3】_The term Li-Fi was【C4】_by Edinburgh Universitys Prof Harald Haas【C5 】_the technology is also known as visible light communications (VLC). Many experts claim that Li-Fi represents the future of mobile internet【C6】_its reduced costs and greater efficiency compared to trad
4、itional Wi-Fi. Both Wi-Fi and Li-Fi transmit data【 C7】_the electromagnetic spectrum, but 【C8】_Wi-Fi utilizes radio waves, Li-Fi uses visible light. This is a【C9】_advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater
5、data【C10 】_Li-Fi signals work by【C11】_bulbs on and off【C12】_quickly too quickly to be noticed by the human eye. This most recent breakthrough builds upon this by using tiny micro-LED bulbs to【C13 】_several lines of data in parallel. The research was carried out by the Ultra Parallel Visible Light Co
6、mmunications project, and funded by the Engineering and Physical Sciences Research Council.Existing LED light bulbs could be【C14】_to transmit Li-Fi signals with a single microchip, and the technology would also be of use in situations where radio frequencies cannot be used for fear of【C15】_with elec
7、tronic circuit. And although Li-Fi bulbs would have to be kept on to transmit data, the bulbs could be【C16】_to the point that they were not visible to humans and yet still【C17 】_. One draw-back is that the data receiver would have to be in sight of the transmitter-bulb as visible light does not【C18】
8、_solid materials.The makers of Li-Fi note that this quality might actually be an advantage in some【C19】_making Li-Fi more 【C20 】_than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.1 【C1 】(A)subsequently(B) presently(C) lately(D)previously2 【C
9、2 】(A)produced(B) stimulated(C) contributed(D)increased3 【C3 】(A)truth(B) proof(C) act(D)growth4 【C4 】(A)produced(B) coined(C) composed(D)designed5 【C5 】(A)unless(B) if(C) though(D)since6 【C6 】(A)thanks to(B) in spite of(C) but for(D)except for7 【C7 】(A)by(B) with(C) upon(D)over8 【C8 】(A)although(B)
10、 if(C) whereas(D)because9 【C9 】(A)dubious(B) additional(C) distinguishable(D)distinct10 【C10 】(A)density(B) structure(C) analysis(D)collection11 【C11 】(A)adjusting(B) modifying(C) switching(D)changing12 【C12 】(A)identifiably(B) incredibly(C) constantly(D)frankly13 【C13 】(A)stream(B) move(C) stir(D)f
11、loat14 【C14 】(A)controlled(B) created(C) converted(D)regulated15 【C15 】(A)combining(B) connecting(C) competing(D)interfering16 【C16 】(A)lowered(B) brightened(C) flickered(D)dimmed17 【C17 】(A)functional(B) noticeable(C) transparent(D)conspicuous18 【C18 】(A)pierce(B) prick(C) penetrate(D)stab19 【C19 】
12、(A)plots(B) scenarios(C) places(D)settings20 【C20 】(A)secure(B) risky(C) definite(D)dangerous20 Children need exercise. Parents often worry that【C1 】_time for athletics or even for just playing on the Jungle Jim is going to take away from their kids【C2 】_achievement. But actually, the【C3 】_is true.
13、There have been analyses of huge numbers of studies that all show that kids who are【C4】_are better in school, get better grades, and have higher【C5 】_scores than kids who lack of exercise. And that is probably because【C6】_the lifespan, even into old age, theres a strong correlation between a healthy
14、 heart and a healthy brain.The brain is the most【C7 】_organ that your circulatory system has to【C8 】_. It takes up a lot of the bodys oxygen and a lot of the bodys【C9】_. And unlike most of your【C10 】_your brain cant live very long【C11 】_that blood supply. You cut blood supply off for about five minu
15、tes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12 】_source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】_intellectual performance.The o
16、ther thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】_, and parents should really【C15】_, I think, on making sure that thats fun, first of all. You dont want to【C16 】_exercise as punishment. And you also, I think, want to have them doing
17、 something that could potentially continue into adulthood.【C17】_much your kids like climbing trees, theyre not going to be doing that when theyre 40, not most of us anyway.And【C18】_you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】_reduce the chance
18、 that theyre going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】_happens around the age of 13 or so.21 【C1 】(A)wasting(B) spending(C) making(D)killing22 【C2 】(A)physical(B) academic(C) social(D)educational23 【C3 】(A)story(B) worry(C
19、) expectation(D)opposite24 【C4 】(A)fit(B) good(C) positive(D)inactive25 【C5 】(A)test(B) sports(C) wisdom(D)intelligence26 【C6 】(A)for(B) across(C) before(D)by27 【C7 】(A)challenging(B) necessary(C) simple(D)demanding28 【C8 】(A)constitute(B) keep(C) feed(D)foster29 【C9 】(A)nerve(B) energy(C) food(D)po
20、wer30 【C10 】(A)cells(B) textures(C) parts(D)tissues31 【C11 】(A)without(B) including(C) with(D)except32 【C12 】(A)splendid(B) rich(C) large(D)significant33 【C13 】(A)reduces(B) intensifies(C) enhances(D)aggravates34 【C14 】(A)moving out(B) moving around(C) moving up(D)moving on35 【C15 】(A)depend(B) coun
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