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Something like a caste line is emerging centered around knowledge.Individuals who fall too far behind in the（）of knowledge at a young age will find it almost impossible to catch up later,no matter how hard they try.

A.control
B.mastery
C.search
D.pursuit

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Text3 In the past several years,as the nascent medium of virtual reality has come into its own,scientists and creators have begun to explore its potential effects on the human mind.Some are undoubtedly positive-as,for instance,when the technology is used to help war veterans overcome posttraumatic stress disorder,or as a means to expand a person's capacity for compassion.But the immediacy of virtual reality has a dark side,too.Several months ago,Michael Madary and Thomas K.Metzinger,researchers from the Johannes Gutenberg University of Mainz,in Germany,published a series of recommendations on the ethical design and implementation of virtual reality.Their appraisal of the medium's psychological force is both studious and foreboding. The power of virtual reality to induce particular kinds of emotions could be used deliberately to cause suffering, they write. Conceivably,the suffering could be so extreme as to be considered torture. In filmmaking,the director must perform a kind of seduction of dread,leading viewers through an escalating series of psychological states.In the immersive world of virtual reality,no such dance is required.Part of the power of virtual reality-based horror comes from the fact that the director knows exactly where the viewer is looking. With that knowledge,we can play mind tricks or trigger events based on the gaze, Jon Hibbins,the director of Psytec Games,a London-based virtual reality studio,said.For instance,he said,in Psytec's most recent fantasy-horror title,Crystal RiR, a monster can appear in a vent only when the player looks at the vent. Hibbins claims that,as viewers'brains are tricked into believing that they are physically present in a reality,the memories they form are much stronger than those made when watching so-called flat-screen media.To soften these memories,Hibbins and his team have introduced a slider into their game that allows players to control the intensity of the horror. 'Normal'will be an average scare experience, he said. You'Il hear voices in the distance,ghosts in the corridors,sound from the voids,and snakes in the corridors.'Extreme'introduces jump scares,such as ghost figures that run through your body.It really does offer everyone an option. Stephan said, Long-term,perhaps it's a case of building literacy in players and viewers so they understand when the scares are coming.For now,I think that means taking it slow. 35.Which of the following would be the best title ofthe text?

A.TheDarkSideofVirtualReality
B.TheComingHorrorofVirtualReality
C.WaystoSlowdownHorrorinVirtualReality
D.VirtualReality'sContributiontoGames

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Text3 NASA has hired airplane manufacturer Lockheed Martin to build its next experimental plane,which is designed to fly faster than the speed of sound without producing the loud sonic booms that have plagued the transportation form.The plane is due to be delivered in 2021 and will cost just shy of$250 million.During a press conference hosted by the agency during which they announced the partnership,Lockheed Martin spokesperson Dave Richardson explained that the new plane will be neither a prototype for a new commercial airplane,nor a reincamation of previous supersonic jets. This is a purpose-built experimental research craft, he said. This aircraft was designed from a clean sheet. NASA will use the plane to gather data about the impact ofits low-boom design,which the agency hopes will address the single biggest challenge of supersonic flight.Flying faster than the speed of sound produces shock waves that result in a loud booming sound. The air does not know that the airplane is coming, Peter Coen,a NASA project manager for supersonic technology,explained during the press conference,Because no one liked hearing that noise,the Federal Aviation Administration and similar international organizations banned supersonic travel over land,Now,NASA thinks technology can break the sound barrier without being quite so loud about it.The secret is in the shape of the plane.Sonic booms form because the plane's flight produces many shock waves of different strengths headed in different directions that absorb into each other to create two strong pulses of pressure.From the testing done so far,NASA thinks the new plane's design successfully dissipates and weakens those shock waves,keeping them from forming the strong pulses responsible for booms.The plane would still produce what they've dubbed sonic thumps, but the hope is that those would be much easier to deal with.Once the new plane is built,NASA will run surveys on the ground to see how people respond to the sonic thumps.Then,the agency will bring that survey data to the Federal Aviation Administration and its intemational counterparts in order to revisit the rule about breaking the speed of sound over land. It's not about making a new airplane for airplanes'sake,although I love airplanes, Richardson said. It's about the data that will be collected. If the rule change does come through,that could kick off a new era of commercial supersonic travel.31.According to the first two paragraphs,the experimental plane

A.willneedanexactbudgetof$250million
B.willbeputintoservicein2021
C.isdesignedfromanentirelynewangle
D.isbasedonanewcommercialpurpose

Something like a caste line is emerging centered around knowledge.Individuals who fall too far behind in the（ ）of knowledge at a young age will find it almost impossible to catch up later,no matter how hard they try.

Something like a caste line is emerging centered around knowledge.Individuals who fall too far behind in the（）of knowledge at a young age will find it almost impossible to catch up later,no matter how hard they try.