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10、2024衡水金卷先享题答案英语二

C.By analyzing the direction of the signals.D.By focusing on some random radio noise.30.What do we know about the radio signal found by Shane Smith?A.It was sent by some space aliens.B.It lay in the centre of Proxima Centauri.C.It was noticed as soon as it was observed.D.It changed rapidly with the passing of time.31.What might be talked about in the paragraph following the text?A.How aliens think about the radio signal.B.The potential results of the radio signal.C.The importance of finding the radio signal.D.How other countries react to the radio signal.DA wise driver keeps an eye on the fuel indicator(指示器)，to make timely stops atfilling stations.For drivers of electric cars,though,those stations are scarce.The facilityneeded for refilling batteries has yet to be developed,and the technology that facility willuse is still not available at the moment.Most electric cars are equipped with plugs.Butplugs and their connected cables and charging points bring problems.The cables are easy totrip passers-by.The charging points lead to more street jams.And the copper wire involved.attracts thieves easily.Many engineers would,therefore,like to develop a second way ofcharging electric cars-one that is wireless and can thus be buried underground.Electromagnetic induction(电a磁感应)，the fundamental principle behind wirelesscharging,was discovered by Michael Faraday in 1831,and is widely used in things such aselectric motors and generators.Faraday observed that moving a conductor through amagnetic field generated a current in that conductor.Further investigations showed thatthis also works if the conductor is fixed and the magnetic field is moving.Since electriccurrents generate magnetic fields,and if the current changes so does the field,a changingcurrent creates a field that is constantly moving.This means that running such a currentthrough a conductor will generate a similar current in another,nearby,conductor.Thatgenerated current can then be used for whatever purpose an engineer chooses.In the case of electric car charging,the first conductor is a length of copper wire.Thisis rolled up around a piece of ferrite()that strengthens the magnetic fieldgenerated.The whole device is packed in a flat case that can be easily buried underground.When a car equipped with a suitable "pickup"stops or parks above this device,andchanging current is fed into it,a similar current is generated in the pickup.This is then英语试题第7页共12页