2019.6六级真题第三套.pdf
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1、2019 年年 6 月大学英语六级考试真题月大学英语六级考试真题(第第 3 套套)Part IWriting(30 minutes)Directions:For this part,you are allowed 30 minutes to write an essay on the importance of motivation andmethods in learning.You should write at least 150 words but no more than 200 words._PartListening Comprehension(30 minutes)说明:由于说
2、明:由于 2019 年年 6 月六级考试全国共考了月六级考试全国共考了 2 套听力,本套真题听力与前套听力,本套真题听力与前 2 套内容完全一样,只是顺序不一样,因此在本套真题中不再重复出现。套内容完全一样,只是顺序不一样,因此在本套真题中不再重复出现。Part Reading Comprehension(40 minutes)SectionADirections:In this section,there is a passage with ten blanks.You are required to select one word for each blankfrom a list of
3、choices given in a word bank following the passage.Read the passage through carefully beforemaking your choices.Each choice in the bank is identified by a letter.Please mark the corresponding letter foreach item on Answer Sheet 2 with a single line through the centre.You may not use any of the words
4、 in the bankmore than once.Steel is valued for its reliability,but not when it gets cold.Most forms of steel26become brittle(脆的)attemperatures below about-25 unless they are mixed with other metals.Now,though,a novel type of steel hasbeen developed that resists27at much lower temperatures,while reta
5、ining its strength and toughness without the need for expensive28.Steels fragility at low temperatures first became a major concern during the Second World War.AfterGermanU-boatstorpedoed(用 鱼 雷 攻 击)numerousBritishships,a2,700-strongfleetofcheap-and-cheerful“Liberty ships”was introduced to replace th
6、e lost vessels,providing a lifeline for the29British.But the steel shells of hundreds of the ships30in the icy northAtlantic,and 12 broke in half and sank.Brittleness remains a problem when building steel structures in cold conditions,such as oil rigs in the Arctic.So scientists have31to find a solu
7、tion by mixing it with expensive metals such as nickel.Yuuji Kimura and colleagues in Japan tried a more physical32.Rather than adding other metals,theydeveloped a complex mechanical process involving repeated heating and very severe mechanical deformation,known as tempforming.The resulting steel ap
8、pears to achieve a combination of strength and toughness that is33to that of modemsteels that are very rich in alloy content and,therefore,very expensive.Kimuras team intends to use its tempformed steel to make ultra-high strength parts,such as bolts.They hopeto reduce both the number of34needed in
9、a construction job and their weightby replacing solid supportswith35tubes,for example.This could reduce the amount of steel needed to make everything fromautomobiles to buildings and bridges.A)abruptlyI)crackedB)additivesJ)fracturesC)approachK)hollowD)ardentlyL)relevantE)besiegedM)reshuffledF)channe
10、lN)strivedG)comparableO)violentH)components第 1 页 共 6 页Section BDirections:In this section,you are going to read a passage with ten statements attached to it.Each statementcontains information given in one of the paragraphs.Identify the paragraph from which the information is derived.You may choose a
11、 paragraph more than once.Each paragraph is marked with a letter.Answer the questions bymarking the corresponding letter on Answer Sheet 2.The future of personal satellite technology is hereare we ready for it?A)Satellites used to be the exclusive playthings of rich governments and wealthy corporati
12、ons.But increasingly,as space becomes more democratized,they are coming within reach of ordinary people.Just like drones(无人机)before them,miniature satellites are beginning to fundamentally transform our conceptions of who gets todo what up above our heads.B)As a recent report from the National Acade
13、my of Sciences highlights,these satellites hold tremendous potentialfor making satellite-based science more accessible than ever before.However,as the cost of getting your ownsatellite in orbit drops sharply,the risks of irresponsible use grow.The question here is no longer“Canwe?”but“Should we?”Wha
14、t are the potential downsides of having a slice of space densely populated byequipment built by people not traditionally labeled as“professionals”?And what would the responsible andbeneficial development and use of this technology actually look like?Some of the answers may come from anonprofit organ
15、ization that has been building and launching amateur satellites for nearly 50 years.C)Having your personal satellite launched into orbit might sound like an idea straight out of science fiction.Butover the past few decades a unique class of satellites has been created that fits the bill:CubeSats.The
16、“Cube”here simply refers to the satellites shape.The most common CubeSat is a 10cm cube,so small that asingle CubeSat could easily be mistaken for a paperweight on your desk.These mini-satellites can fit in alaunch vehicles formerly“wasted space.”Multiples can be deployed in combination for more com
17、plex missionsthan could be achieved by one CubeSat alone.D)Within their compact bodies these minute satellites are able to house sensors and communicationsreceivers/transmitters that enable operators to study Earth from space,as well as space around Earth.Theyreprimarily designed for Low Earth Orbit
18、(LEO)an easily accessible region of space from around 200 to 800miles above Earth,where human-tended missions like the Hubble Space Telescope and the International SpaceStation(ISS)hang out.But they can attain more distant orbits;NASA plans for most of its futureEarth-escaping payloads(to the moon a
19、nd Mars especially)to carry CubeSats.E)Because theyre so small and light,it costs much less to get a CubeSat into Earths orbit than a traditionalcommunications or GPS satellite.For instance,a research group here at Arizona State University recentlyclaimed their developmental small CubeSats could cos
20、t as little as$3,000 to put in orbit.This decrease in costa11ows researchers,hobbyists and even elementary school groups to put simple instruments into LEO or evenhaving them deployed from the ISS.F)The first CubeSat was created in the early 2000s,as a way of enabling Stanford graduate students to d
21、esign,build,test and operate a spacecraft with similar capabilities to the USSRs Sputnik(前苏联的人造卫星).Sincethen,NASA,the National Reconnaissance Office and even Boeing have all launched and operated CubeSats.There arc more than 130 currently in operation.The NASA Educational Launch of Nano Satellite pr
22、ogram,which offers free launches for educational groups and science missions,is now open to U.S.nonprofitcorporations as well.Clearly,satellites are not just for rocket scientists anymore.G)The National Academy of Sciences report emphasizes CubeSats importance in scientific discovery and thetraining
23、 of future space scientists and engineers.Yet it also acknowledges that widespread deployment of LEOCubeSats isnt risk-flee.The greatest concern the authors raise is space debrispieces of“junk”that orbit theearth,with the potential to cause serious damage if they collide with operational units,inclu
24、ding the ISS.H)Currently,there arent many CubeSats and theyre tracked closely.Yet as LEO opens up to more amateur第 2 页 共 6 页satellites,they may pose an increasing threat.As the report authors point out,even near-misses might lead tothe“creation of a burdensome regulatory framework and affect the fut
25、ure disposition of science CubeSats.”I)CubeSat researchers suggest that nows the time to ponder unexpected and unintended possible consequences ofmore people than ever having access to their own small slice of space.In an era when you can simply buy aCubeSat kit off the shelf,how can we trust the sa
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