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B.The researchers focused on how the fruit fly's nervous system reacts to scents.C.The researchers trained the model in the same way as training fruit fliesD.The researchers presented two different scents to carry out a control experiment.30.What do the results of the research imply?A.Insects'nervous systems are more sensitive to particular scents.B.Artificial intelligence is significant to biological brain research.C.Sensory information is widely applied in machine learning.D.Research on insect brain can contribute to AI development.31.What is the main purpose of the text?A.To present predictions about the future of machine learning.B.To illustrate the method and findings of a scientific study.C.To call on more research on insect brain and behavior.D.To introduce a practical method of insect research.DSpace is becoming more crowded.On December 3,a Falcon 9 rocket made by Space X thundered into the sky.Onboard were 64 small satellites,more than any American company had launched before in one go.They have a variety ofuses,from space-based-radar to the monitoring of radio-frequency-emissions.They will be working in their orbits()These objects are part of the latest breed of low-Earth-orbit (LEO)satellites.This launch is just taste of what is planned.Space X and One Web,a communications firm,plan to launch satellites in their thousands,not hundreds.The pair are set todouble the total number of satellites in orbit by 2027.That promises to change things dramatically on Earth.LEO satellites can bring internet connectivity to places where itis still unavailable or unaffordable.This will also be a lasting source of new demand for the space economy.MorganStanley,a bank,projects that the space industry will grow from $350 billion in 2016 to more than $1.1 trillion by 2040.New internet satellites will account for a half this increase.For that to happen,however,three worries must be overcome.Debris()is the most familiar concern.As long agoas 1978,Donald Kessler,a scientist at NASA,proposed a situation in which,when enough satellites were packed intolow-Earth orbits,any collision could cause a chain reaction which would eventually destroy all space craft in the sameorbital plane.The syndrome which bears Mr.Kessler's name weighs heavily on the minds of executives at the new satellitefirms.Debris could cause entire tracts(广阔的一片)of space to be unusable for decades.Solutions exist.One is to grab malfunction satellites and pull them down into Earth's atmosphere.Another is tomonitor space more intensively for debris;a US Air Force program me called Space Fence is due to start in 2019.Buttechnology is only part of the answer.Rules are needed to govern the safe disposal ofold satellites from low-Earth orbit.Cyber-security is a second,long-standing worry.Hackers could take control of a satellite and seal intellectual property,redirect data flows or cause a collision.The satellite industry has been slow to respond to such concerns.But as more of theworld's population comes to rely on the infrastructure of space for access to the internet,the need for action intensifies.The third issue follows from the first two.If a simple mistake or a cyber-attack can cause a chain reaction which wipesout hundreds of billions of dollars of investment,who is liable?Underwriters()are studying the plans of firms(quitea lot)that wish to operate large numbers of satellites.But there is a long way to go before the risks are well understood,letalone priced.第5页共8页命题人:黎成淑、李继、石静、唐垚、杨璐媛审题人:李继
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