All the world will have been developed — even Antarctica. There will be large cities in Antarctica.We already have supersonic(超音速的) flight, but in a hundred years’ time we will have supersonic land travel as well.

　　We will have used up most of earth抯 land to build our cities, so floating cities will have been built.The Japanese already have plans for cities of this kind. And there will be cities under the sea. The first of these will have been completed. r

　　68. We will have developed ____in a hundred years’time, permitting long journeys all over the solar system.

　　A. cheap rockets for space travel

　　B. a plane

　　C. a spaceship

　　D. a satellite

　　69. Man will also have supersonic land travel ______ .

　　A. in a year

　　B. about half a century later

　　C. about a century later

　　D. in the year 2050

　　70. The last paragraph mainly talks about ______ .

　　A. new ways of building cities

　　B．the building of cities under the sea

　　C．the building of floating cities in Japan

　　D．the danger which earth's land will face

　　71. The best title for the passage is ______ .

　　A. Travel in the Future

　　B. Space Travel

　　C. Where to Live in the Future

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