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问题：We can use energy from the sun because ______....
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问题：Whistles could also be used to communicate between adult dolphins and baby dolphins.A．RightB．WrongC．Not mentioned...
问题：These are their motives for doing it.A．reasonsB．excusesC．answersD．plans...
问题：In Britain and many other countries appraisal is now a tool of management.A．evaluationB．efficiencyC．productionD．publicity...
问题：Smart WindowWindows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Research...
问题：What was scientists' understanding of cryptic species?A．They occurred in equal numbers in all biogeographical regions.B．They were mostly found in insects and reptiles.C．They were likely to be in tropical rather than temperate regions.D．Both Ｂ and Ｃ....
问题：A great deal has been done to remedy the situation.A．maintainB．improveC．assessD．protect...
问题：Which of the following about the African bush elephant and the African elephant is true?A．The WCU are interbreeding those elephants.B．They are interbreeding species.C．They are two genetically distant species.D．They depend on each other for survival....
问题：Hearing problems may be alleviated by changes in diet and exercise habits.A．removedB．curedC．worsenedD．relieved...
问题：These programmes are of immense value to old people.A．naturalB．fatalC．tinyD．enormous...
问题：People are confused in their attempts to control malaria in Europe in the early 1900s, because scientists ______.A．identified only one mosquito species instead of six speciesB．thought only three mosquito species transmitted diseaseC．thought there was only...
问题：And the cars are tested for defects before leaving the factory.A．functionsB．faultsC．motionsD．parts...
问题：Do scientists know how many cryptic species exist?A．Not yet.B．Yes, they do.C．They will know the answer in another one or two years.D．They will never know the answer....
问题："Hidden" Species May Be Surprisingly CommonCryptic species animals that appear identical but are genetically quite distant—may be much more widespread than previously thought. The findings could have major implications in areas ranging from biodiversity e...
问题：The energy stored in coal ______....
问题：Thousands of people perished in the storm.A．diedB．sufferedC．floatedD．scattered...
问题：______ when electron rearrangement takes place....
问题：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 l...
