Rayon was the most colninon synthetic material discovered—54%.Though rayon is not a plastic(it’s made from wood),the authors included it“because it is a manmade semi.synthetic that makes up a significant proportion of synthetic microparticles found in the marine environment.”Rayon is used in cigarette filters，clothing and personal hygiene products.Polyester(聚酯)was the next most common pollutant found in the ice(21%)，followed by nylon(16%)，polypropylene(聚丙烯)(3%)and polystyrene，acrylic and polyethylene (2%each).

　　The authors cA.led the ice trap“a major historic globA. sink of man.made particulates.”and said their findings“go some way to help clarify one of the most puzzling aspects of current understanding on the quantities of plastic debris reported in the oceans.”As Science points out，288 million tons of plastics were produced in 2012.

　　Micro plastics garbage has aso been found on the shores of southernmost Chile，so the authors said it’s time to investigate the planet’s other polar region.“WHile multiyear sea ice makes up a smaller proportion of aunual sea ice cover in the Southem Ocean.and perenniA. sea ice cover around Antarctica is following different trends,our finding indicate the importance of sampling ice from the Antarctic to see if it too contains micro plastics，”they write.

　　56.According to the passage.what are mainly called“micro plastics”?

　　A.The pollutants come mostly from debris.

　　B.The pollutants come mostly from fibers.

　　C.The pollutants come mostly from cosmetics.

　　D.The pollutants come mostly from daily supplies.

　　57.What does the phrase“wind uP”mean in Para.2?

　　A.putan endto

　　B.screwup

　　C.sweep across

　　D.roll up

　　58.Why does the author include“rayon”in.though it is not a plastic?

　　A.Because it is a significant manmade semi.synthetic discovered in the ocean.

　　B.Because it is a major natural semi.synthetic appearing in the marine.

　　C.Because it is a minor manmade synthetic dug out in the marine.

　　D.Because it is a significant natural synthetic explored in the marine.

　　59.What can we infer from the ice trap“a major historic global sink of mail-made particulates”?

　　A.The historic sink should be attributed to man-made particulates.

　　B.People on a worldwide scA.e have reaped what they had sown.

　　C.The ice trap is of major historic meaning on the globA. context.

　　D.The major historic globA. sink is derived from the ice melting.

　　60.What’s the best title of this passage?

　　A.Rayon was the most common synthetic in the ocean.

　　B.It’s time to research the planet’s other polar region.

　　C.Trillions of plastic pieces found in the Arctic ice.

　　D.Trillions of plastic pieces will wind up in the ocean.

　　Questions 61 to 65 are based on thefollowingpassage.

　　The Wall Street Journal quoted sources close to the company as saying a run of 4.000 devices will be manufactured next month.The tablet will have two rear-facing cameras and advanced imaging software——and will be shown off at the firm’s forthcoming developers’conference.Google has said it will not comment on“rumor and speculation”.But in March，Google showed off Project Tango，all effort to bring 3D technology to its handheld devices.A prototype smart phone had been given out to 200 developers to try out.

　　The technology makes use of infrared sensors to measure depth of surroundings.While the ability to create 3D images with small devices is by no means a new technologicA. feat，Google’s strategy will be to harness the hardware to contribute to，among other things，its mapping effort.For instance，the devices could be used to create quickly a 3D map of indoor environments.According to the Wall Street Journal，the 3D tablet will be shown offat Google’s annual developers’conference at the end ofJune.

　　As it did with the Google Glass eyewear product.it is expected the firm will A.low a select number of developers and engineers to experiment with the technology before a consumer launch is planned.although still a relatively minor industry,the race to create the“killer app”for building and viewing virtual reality environments is building a pace.In March，Facebook swooped in on a$2bn(￡1.2bn) deal for Oculus VR，a company making a virtuA. reA.ity headset.

　　A mini-site for Project Tango has highlighted a few of the firm’s plans in the area.“Project Tango is an attempt to create a mobile device unlike like any other,”the site explains.“A mobile device that shares our sense of space and movement，that understands and perceives the world the same way we do.”

　　In the past few years，devices able to view and create 3D images have made it to market，but suffered heavily from a lack of consumer interest，said Jack Kent，an analyst at IHS.“If Google really pushes it，that might change dynamics of the market。”he told the BBC.

　　61.What is the feature ofthe new tablet?

　　A.It will have two pre-facingcameras and advanced imaging soRware.

　　B. It will have one rear-facing camera and advanced imaging hardware.

　　C.It will have two rear-facing carneras and advanced imaging software.

　　D.It will have one pre.facing camera and advanced imaging hardware.

　　62.What contribution will Google’s strategy make to its mapping effort?

　　A.The devices could be used to take a clear photo for indoor environments.

　　B.111ey can be applied to the accurate 3D imaging of indoor environments.

　　C.They can be employed to create a probable 3D map of indoor environments.

　　D.They could be utilized to form quickly a 3D map of indoor environments.

　　63.Which one is the correspond meaning of“killer app”in Para.3?

　　A.the fiercest app.

　　B.the most useful app.

　　C.tile most crucial app.

　　D.the top secret app.

　　64.What makes the expected mobile device distinctive according to Para.4?

　　A. It could understand and perceive the world in its particular way.

　　B. It call possess the sanle perception of our own for the whole world.

　　C.It could be utilized to share our sense of the world.

　　D.It can share our sense of space and movemem and perceive the world as we do.

　　65.How does the author think ofthe prospect ofdevices able to create 3D images?

　　A.These devices will probably have a bright future.

　　B.They、would be always in a lack of consumer interest.

　　C.They may be in a way shut out ofthe market.

　　D.They could suffer from a bleak future in all the products.