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These are their motives for doing it.
A．reasons
B．excuses
C．answers
D．plans
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Channel Dolphin and Wildlife Foundation (SDWF) has been studying a group of up to 120 bottle-nose dolphins in the River Shannon using vocalisations collected on a computer in a cow shed near the River Shannon.As part of a research project, student Ronan Hickey digitised and analysed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories. Of the categories, he found most were used by both sets of dolphins—but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them with behaviour like foraging, resting, socialising and the communications of groups with calves," project leader Simon Berrow said. "Essentially we are building up what is like a dictionary of words they use or sounds they make. "Berrow, a marine biologist, said the dolphins' clicks are used to find their way around and locate prey. The whistles are communications. "They do a whole range of other sounds like barks, groans and a kind of gunshot. " He said. "The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey. ""When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales. " Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.The difference in eating habits between the bottle-nose dolphins and the sperm whales interested the SDWF scientists.A．RightB．WrongC．Not mentioned
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The Building of the PyramidsThe oldest stone buildings in the world are the pyramids.【46】 There are over eighty of them scattered along the banks of the Nile, some of which are different in shape from the true pyramids. The most famous of these are the "Step" pyramid and the "Bent" pyramid.Some of the pyramids still look much the same as they must have done when they were built thousands of years ago. Most of the damage suffered by the others has been at the hands of men who were looking for treasure or, more often, for stone to use in modem buildings.【47】. These are good reasons why they can still be seen today, but perhaps the most important is that they were planned to last for ever. 【48】. However, there are no writings or pictures to show us how the Egyptians planned or built the pyramids themselves.【49】. Nevertheless, by examining the actual pyramids and various tools which have been found, archaeologists have formed a fairly cleat picture of them.One thing is certain: there must have been months of careful planning before they could begin to build.【50】 You may think this would have been easy with miles and miles of empty desert around, but a pyramid could not be built just anywhere. Certain rules had to be followed, and certain problems had to be overcome.A. The dry climate of Egypt has helped to preserve the pyramids, and their very shape have made them less likely to fall into ruin.B. It is practically certain that plans were made for the building of the pyramid because the plans of other large works have fortunately been preserved.C. The first thing they had to do was to choose a suitable place.D. Consequently, we are only able to guess at the methods used.E. Many people were killed while building the pyramids.F. They have stood for nearly 5,000 years, and it seems likely that they will continue to stand for thousands of years yet.(46)
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Crashed Cars to Text Message for HelpThere is no good place to have a car crash -- but some places are worse than others. In a foreign country, for instance,【51】 to explain via cellphone that you are upside down in a ditch (沟渠) when you cannot speak the local language can fatally (~) delay the arrival of the emergency services.But an answer may be at hand. Researchers funded by the European Commission are beginning tests of a system called E-merge that【52】senses when a ear has crashed and sends a text message, telling emergency services in the local language that the accident has taken place.The system was【53】 by ERTICO, a transport research organization based in Brussels. Belgium. Cars are fitted with a eellphone-sized device attached【54】 the underside of the dashboard (仪表板) which is activated by the same sensor that triggers the airbag in a crash. The device【55】 a cellphone circuit, a GPS positioning unit and a microphone and loudspeaker.It registers the severity of the crash by【56】 the deceleration data from the airbag's sensor. Using GPS information, it works out which country the Car is in, and from this it determines【57】 which language to compose an alert message detailing precise location of the accident.The device then automatically makes a call to the local emergency services【58】. If the car's occupants are conscious, they can communicate with the operator【59】 the speaker and microphone.E-merge also transmits the vehicles make, model, color and license number, and its heading' when it crashed, which in rum indicates on which side of a multi-lane highway it ended up.This【60】 the emergency services find the vehicle as soon as they arrive on the scene. "We can waste a large【61】time searching for an incident, "says Jim Hammond, a(an)【62】in vehicle technology at the Association of Chief Police Officers in the UK. Tests will begin soon with police car fleets in the UK. Trials have already started in Germany, Sweden, Spain, the Netherlands and Italy.In-car systems that summon (召集) the emergency services after a crash have【63】been fitted in some premium cars". ERTICO says that【64】EU states "are willing to fund the necessary infrastructure (基础结构), E--merge could be working by 2008.A study by French car maker Renault" concluded that the system could save up to 6000 of the 40,000 lives lost each year on Europe's roads, and prevent a similar number of serious injuries.The Renault study estimates that fitting E-merge to every car in Europe would eventually save around 150 billion per【65】in terms of reduced costs to health services and insurance companies, and fewer lost working days.(51)A．tryB．triedC．tryingD．having tried
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In Britain and many other countries appraisal is now a tool of management.A．evaluationB．efficiencyC．productionD．publicity
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The energy stored in coal ______.
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