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Prince William took a visit to the Forbidden City on Feb.28, ______ emperors once lived.

A.which B.whose C.where D.when

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Step into a Prius, and turn on the engine. The first thing you notice is how much quieter it is than a traditional car. At this point, the car's gasoline engine is dormant (休眠). The electric motor will provide power until the car reaches about 24 km/h. If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.

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C. introduce a new kind of "green" car

D. announce plans to develop hybrid vehicles for China

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C. China's new cars are combinations of different green models

D. China is still young and lacking experience

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B. They are much quieter than traditional cars.

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D. They are powered by both a rechargeable battery and gasoline.

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International teams have spent nearly half a year looking for evidence of the missing Malaysian Airlines plane, a search that includes the hunt for the aircraft’s so-called black box, which holds flight data that would likely explain what caused MH370 to move away from its course. But many aviation experts wonder why, in our increasingly networked world, divers are searching the Indian Ocean for a metal box when technology already exists that would enable planes to stream black box data to the ground in the event of an emergency.

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