题干

   You'll probably never go to Mars or sing on the stage with The Rolling Stones. But if virtual reality (VR)ever lives up to its promise, you might be able to do all these things - and many more - without even leaving your home.Unlike real reality, virtual reality means simulating(模拟)bits of our world. Apart from games and entertainment, it's long been used for training airline pilots and surgeons and for helping scientists to figure out difficult problems such as the structure of protein molecules(蛋白质分子). Then how does it work?

Close your eyes and think of virtual reality and you probably picture something like this:a man wearing a wrap-around headset and data gloves wired into a powerful workstation or supercomputer. What distinguishes VR from an ordinary computer experiences the nature of the input and output. While an ordinary computer uses things like a keyboard, a mouse, or speech recognition for input, VR uses sensors that detect how your body is moving. A PC displays output on a screen while VR uses two screens (one for each eye) , surround-sound speakers, and maybe some forms of touch and body feedback as well.

VR has been routinely used by scientists,doctors, engineers, architects, archaeologists, and the military for about the last 30 years. Difficult and dangerous jobs are hard to train for. How  can you safely practice taking a trip to space, making a parachute jump, or carrying out brain surgery? All these things are obvious candidates for virtual reality applications.

Like any technology, virtual reality has both good and bad points. Critics always raise the risk that people may be addicted to alternative realities to the point of ignoring their real-world lives, but this criticism has been leveled at everything from radio and TV to computer games and the Internet. Like many technologies, VR takes little or nothing away from the real world: you don't have to use it if you don't want to.

【小题1】According to the passage, virtual reality means ____________ .
A.imagining beautiful things in our mind
B.creating something that doesn't exist
C.creating an environment that seems real
D.cloning something that has died out
【小题2】What equipment do we probably need for virtual reality?
A.A keyboard, a headset and a supercomputer.
B.A headset, data gloves and speech recognition.
C.A headset, data gloves and a supercomputer.
D.A keyboard, a mouse and speech recognition.
【小题3】Paragraph 3 is mainly about ____________ .
A.the principles of virtual reality
B.the applications of virtual reality
C.the history of virtual reality
D.the study team of virtual reality
【小题4】What is the writer's attitude towards VR?
A.Appreciative.B.Cautious.
C.Skeptical.D.Indifferent.
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同类题2

   What makes us human?Is it our thoughts?Our emotions?Our behavior?

All of these things make us who we are,but at the center of it all lies the genome — the genes inside our bodies that determine everything from our hair color to our intelligence. But if we could change our genome,would we still be human?

Recently,a group of scientists from the US and South Korea worked together to successfully“edit”a human embryo(胚胎)and remove a genetic mutation(变异)that would have led to heart disease. This was achieved with the help of CRISPR-a gene — editing tool that allows scientists to edit the genome by cutting,changing or adding to parts of it.

Scientists involved in DNA editing are certain about the good of their work,and hope that in the future,diseases could simply be“edited out”.

However,others aren't so sure. People are worried that the science could be used not only to remove life-threatening illness,but also to make a“perfect”baby whose DNA has been chosen to improve its intelligence or other qualities. They say that this is a shallow way of thinking about raising children.

“It makes you think about who we are as people,and it makes you ask if humans should use the kind of power…that is changing human evolution(进化),”Jennifer Doudna of the University of California said.

Still,others worry that DNA editing could be turned into an expensive service that would only be available to the people who could afford it. That might mean the rich would be given another advantage in a world where they already have plenty of them.

“You could find wealthy parents buying the technology for their children, leading to even greater inequality than we already live with,”Marcy Darnovsky, director of the San Francisco Center for Genetics and Society, said.

【小题1】Why are the questions asked in Paragraph 1?
A.To attract the readers' interest.
B.To seek answers from the readers.
C.To show those things aren't important.
D.To correct our understanding of human beings.
【小题2】Which of the following will Jennifer Doudna most probably agree with?
A.Having a perfect baby is not so good for the family.
B.Life-threatening illnesses should be removed before birth.
C.DNA editing might cause unexpected problems to humans.
D.DNA editing may enlarge the gap between the rich and the poor,
【小题3】What does the underlined word“them”most probably refer to?
A.Advantages.
B.Expensive services.
C.Perfect children.
D.Qualities
【小题4】What's the author's attitude towards DNA editing?
A.Disappointed.B.Doubtful.
C.Positive.D.Objective.

同类题3

   Shopping centers,stadiums and universities may soon have a new tool to help fight crime.

A California company called Knightscope says its robots can predict and prevent crime. Knightscope says the goal is to reduce crime by half in areas the robots guard.

William Santana Li is the chief executive officer of Knightscope. He says,"These robot security guards will change the world. Our planet has more than seven billion people on it. It's going to quickly get to nine billion people. The security equipment that we have globally is just not going to develop that fast. The company's Autonomous Data Machines can become the eyes and ears of law enforcement(执法)."

"You want them to be machines plus humans. Let. the machines do the heavy and sometimes dangerous work and let the humans do the strategic decision-making work,so it's always working all together."

The machines do not carry weapons but they have day and night video cameras which are able to turn 360 degrees and can also sense chemical and biological weapons.

Some people may become concerned about their privacy, especially in connection with the video recordings. Some people may worry that such recordings will appear on the Internet. Eugene Volokh, a law professor at the UCLA School of Law, says the machines have to be used in the right way and it will be interesting to see how state laws deal with this kind of video.

William Santana Li says there is a long waiting list for the robots in the US. Workers in the company are working overtime to meet the demands of the market. At least 25 other countries are also interested in these robot security guards.

【小题1】What can this new tool do for humans?
A.Make strategic decisions.
B.Keep watching day and night.
C.Carry heavy weapons.
D.Stop crime autonomously.
【小题2】Why are some people worried about the new robots?
A.Their privacy may be let out.
B.The robots are very expensive.
C.Robots will replace humans.
D.They will be out of work soon.
【小题3】Which of the following can be the best title of the text?
A.Robots Are Becoming More Popular
B.Robots Contribute a Lot to the World
C.Robots Are in Great Demand Now
D.Security Robots Could Help Cut Crime

同类题4

   After years of research and tests, the hybrid car was developed and put on the market. It's an interesting and exciting new improvement in today's world as we look for better ways to protect the quality of the air we breathe and protect our natural resources.

The quality of our air is affected by many different things. But one of the largest sources of air pollution is the burning of fossil fuel such as coal and gasoline which is used to power a car's engine. The Environmental Protection Agency(EPA)has set national standards to help control the level of harmful pollutants sent off into the air, and the automobile industry has acted by producing the hybrid car that uses less gas and therefore causes less pollution.

A hybrid car is a combination of a regular car that runs on gasoline and an electric car that is battery-powered. Some people tend to think that since the hybrid car is partially electric, you have to plug it in to charge it. But that's not how it works. The 144 volt battery pack(电池组)is actually recharged through the energy that is produced when the car's brakes are used. This is referred to as "regenerative braking", because it generates electricity.

Although the hybrid car still runs on gasoline most of the time, this helps it use less gas than a regular car. When the driver stops at a traffic light, the engine automatically shuts off to save fuel. Then, as soon as the driver puts the car in gear and touches the gas pedal(踏板), the engine starts backing up.

Have you ever ridden in a car with someone which ran out of gas?That probably wouldn't happen if you were riding in a hybrid car. It flashes a warning on its computer screen that says, "I am low on gas. "When it completely runs out, the warning reads, "YOU ARENOW OUT OF GAS!"Then the electric power supply starts to work to let the driver travel a few more miles to a gas station.

【小题1】Which of the following is true according to the passage?
A.The hybrid car will be put on the market.
B.Hybrid cars run faster than regular cars.
C.When the hybrid car stops at a traffic light, the driver will get a warning.
D.The burning of fossil fuel is one of the largest sources of air pollution.
【小题2】According to the passage, the word "hybrid" refers to_________.
A.a high-tech discoveryB.energy saving
C.a new inventionD.a combination of two things
【小题3】"Regenerative braking" is an important process of the hybrid car because _________.
A.it allows the car to come to a quick stop
B.it gives the driver a smoother ride
C.it produces energy to charge the battery
D.it can control the speed of the car
【小题4】Which of the following is the reason for developing hybrid cars?
A.They use less gas than regular cars.
B.They' re safer to drive than most cars.
C.They' re more modern than other cars.
D.They cost less than regular cars.