Part II Listening Comprehension.(30 minutes)
Section B
Directions: In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter. Answer the questions by marking the corresponding letter on Answer Sheet 2.
47、根據以下資料，回答47-56題：
Directions：In this section，you are going to read a passage with ten statements attached to it．Each statement contains information given in one of the paragraphs．Identify the paragraph from which the information is derived．You may choose a paragraph more than once．Each paragraph is marked with a letter．Answer the questions by marking the corresponding letter on Answer Sheet 2．
Here’s the Totally Amazing Wonder Material That Could Revolutionize Technology
A．In the technology industry,every new product or service seems to come with the promise that it is an innovation with the potential to change the world．Graphene(石墨烯)，a form of carbon，might actually do just that．
B．“Graphene is a wonderful material，”Jeanie Lau，a professor of physics at the University of California at Riverside，told Fortune．“It conducts heat 10 times better than copper and electricity 100 times better than silicon，is transparent like plastic，extremely lightweight,extremely strong,yet flexible and elastic．In the past decade，it has taken the scientific and technology communities by storm，and has become the most promising electronic material to supplement or replace silicon．”
C．Graphene has already found its way into a number of compelling applications，Lau said．For instance，“since it is both transparent and electrically conductive—two attributes rarely found in the same material in nature—it has tremendous potential as the transparent electrode in monitors．displays；solar cells，and touch screens，”she explained．“Companies such as Samsung that invest heavily in this area have already secured patents，produced prototypes，and are expected to bring products to market in a few years．”Wearable electronic devices，aviation components，broadband photodetectors(光電檢測器)，radiation-resistant coatings，sensors，and energy storage are among numerous other areas of active research．Lau said．
D．For many researchers and investors，the ultimate application is graphene-based transistors，the building blocks of modem electronics．But getting there may take some time．
A child of graphite
E．First produced in a lab back in 2004，graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it’s actually considered two-dimensional．“We generally regard anything less than 10 layers of graphene as graphene；otherwise，it’s graphite，”said Aravind Vijayaraghavan，a lecturer in nanomaterials at the University of Manchester．
F．Even“graphene”is a bit of an umbrella term．“To oversimplify,there are two major types of graphene，”Michael Patterson，CEO of Graphene Frontiers，said．The first：“Nanoplatelets，”which are powders or flakes made from graphite．These have been around for a while and are“not really super-sexy,”Patterson said．“You mix them into polymers(聚合物)or inks or rubbers to make them conductive．”In flake form，graphene is already on its way to becoming a commodity,Patterson added．The other type—in sheet or film form—is where graphene’s biggest promise lies．Graphene sheets have“incredible potential for electronics，”Patterson said．In the near term，that potential may manifest in situations where the quantity requirements are“not that great”and where quality or conductivity doesn’t have to be as high，such as in basic touch-screen applications，he said．Products that use graphene in this way could arrive to market in the next six to 1 2 months．
G．Looking a little further out，graphene can be employed in membranes used for water desalination．Lockheed-Martin already has a patented product known as Perforene．“It’s real and it works，but it won’t be economically viable until the product reaches an industrial scale where the cost is measured in pennies per square inch”rather than dollars or tens of dollars per square inch，Patterson explained．
“That’s where we’re working today．”
‘It’s expensive and low-capacity’
H．But use of graphene in semiconductors—the technology’s Holy Grail—is likely a decade away．“Many of the challenges presented by graphene are common to most new materials，”Paul Smith,a patent associate with the Intellectual Property Law Group at Fenwick & West，told Fortune．“The trick is figuring out how to synthesize graphene in a way that first is manufacturable beyond lab scale；second，preserves the desirable properties of the material；and third，can be integrated into a product or technology．”
D．Synthesizing graphene in sheet form is considerably more expensive and time-consuming than producing graphene flakes．Whereas the latter typically involves a“quick and dirty”process by which bulk graphite is disassembled into millions of tiny pieces，Lau explained，large sheets of graphene are carefully“grown”on substrates(基板)such as copper，germanium，or silicon carbide．
J．Graphene sheets are also prone to defects and“very difficult to make in good quality,”Ron Mertens，owner and editor of Graphene-Info．tom，said．Production capacity is also very limited．“There are thousands of small companies that can make graphene，but it’s expensive and low-capacity,”Mertens said．alround wafer measuring one inch in diameter,for instance，costs about$1 00，he added．
K．An even thornier obstacle on the way to graphene transistors is the fact that the material has no“band gap，”an essential property that allows transistors to be turned on and off without leaking electronic charge in the“off”state，said Elias Towe，a professor of electrical and computer engineering at Carnegie Mellon University．
L．“Band-gap engineering has been and remains the biggest challenge in the development of graphene transistors and computer chips．”Lau said．It requires controlling the material almost down at the atomic level，and“that’s really pushing the edges of existing technology,”Patterson said．“In 10 years，we’11 start to see these problems solved．”
‘It is largely a matter of time’
M．If graphene is to succeed as a replacement for silicon，every unit of cost and performance will make a difference，Towe said．
N．“Silicon is hard to displace，with all the billions dollars of investments made in manufacturing infrastructure，”he said．“A replacement for silicon has to offer extraordinary performance at extremely rock-bottom cost to compel industry to change its way．”
O．Though graphene is just 10 years old—in contrast,use of silicon in transistors dates to the early 1950s—considerable progress has already been made．For example，the largest graphene sheet was produced by hand in a laboratory eight years ago；its width was less than that of a human hair．“Nowadays，roll-to-roll printing of graphene sheets up to 1 00 meters long has been achieved，”Lau said．“With the increasing interest，investment，and research in graphene-based technology,I think it is largely a matter of time before the economy of scale kicks in and truly low-cost，large-scale production ofhigh-quality graphene is accomplished，”she added．
注意：此部分試題請在答題卡2上作答。

Nanoplatelet is the powder-or flake-type of graphene that has been used for some time to make conductors and that is being launched on the market．


48、 To encourage industry to replace silicon with graphene，it is necessary for graphene to provide high property at an extremely low expense．


49、 While graphene flakes are roughly processed with bulk graphite，graphene sheets are carefully made on substrates like copper，germanium，or silicon carbide．


50、 In the past ten years．graphene has become a hot topic among the scientific and technology groups．


51、 Perforene won’t come into the market before it can be manufactured at a very low cost．


52、 Despite of a much younger age than silicon，great progress has been made in graphene；and with ever increasing interest，investment and research in graphene technology,it’s probable to manufacture cost- effective graphene of high quality．


53、 Graphene has been attempted to be used for plenty of noticeable applications．


54、 Yet it still needs to take ten years for graphene to be used in semiconductors，which lies at the heart of the technology．


55、 With today’s technology,it is still impossible to control material down at the atomic level．


56、 Elias Towe pointed out that having no“band gap”，the dispensable feature of transistors，makes it more difficult to produce graphene transistors．

　　題型備考： 作文－聽力－閱讀理解－翻譯－題型試題－題型真題－復習輔導－經驗技巧

　　歷年真題：英語四級歷年真題答案及下載匯總

　　考后首發：2014年12月英語四級真題及答案　關注微信對答案

　　233網校英語四級網校老師輔導： 想輕松搞定四級考試？英語四級VIP班課程新升級，不過重學，1元=1課時！限時搶購，趕緊來報名吧?。?！ 報名咨詢：4000-800-233