参考答案： B     答案解析：
150
 A.“By the end of the century,” he said, “there will be no poverty anywhere in the country.”  B.If this prediction comes true, we will be faced with a much greater responsibility than ever before.  C.According to the same predictions, this would result in “an information explosion” as well as “radical and revolutionary changes in the way we work, learn, and do business.”  D.When this prediction came true, more people would be killed than ever before.  E.They were certain that this would not only be “far cleaner than coal and other fossil fuels but far safer and much cheaper.”  F.He added that this “will lead to enormous social problems for unskilled manual workers in particular, who will be unable to find work.”  
参考答案： C     答案解析：
249
 A.“By the end of the century,” he said, “there will be no poverty anywhere in the country.”  B.If this prediction comes true, we will be faced with a much greater responsibility than ever before.  C.According to the same predictions, this would result in “an information explosion” as well as “radical and revolutionary changes in the way we work, learn, and do business.”  D.When this prediction came true, more people would be killed than ever before.  E.They were certain that this would not only be “far cleaner than coal and other fossil fuels but far safer and much cheaper.”  F.He added that this “will lead to enormous social problems for unskilled manual workers in particular, who will be unable to find work.”  
参考答案： F     答案解析：
348
 A.“By the end of the century,” he said, “there will be no poverty anywhere in the country.”  B.If this prediction comes true, we will be faced with a much greater responsibility than ever before.  C.According to the same predictions, this would result in “an information explosion” as well as “radical and revolutionary changes in the way we work, learn, and do business.”  D.When this prediction came true, more people would be killed than ever before.  E.They were certain that this would not only be “far cleaner than coal and other fossil fuels but far safer and much cheaper.”  F.He added that this “will lead to enormous social problems for unskilled manual workers in particular, who will be unable to find work.”  
参考答案： A     答案解析：
447
 A.“By the end of the century,” he said, “there will be no poverty anywhere in the country.”  B.If this prediction comes true, we will be faced with a much greater responsibility than ever before.  C.According to the same predictions, this would result in “an information explosion” as well as “radical and revolutionary changes in the way we work, learn, and do business.”  D.When this prediction came true, more people would be killed than ever before.  E.They were certain that this would not only be “far cleaner than coal and other fossil fuels but far safer and much cheaper.”  F.He added that this “will lead to enormous social problems for unskilled manual workers in particular, who will be unable to find work.”  
参考答案： E     答案解析：
546
 A.“By the end of the century,” he said, “there will be no poverty anywhere in the country.”  B.If this prediction comes true, we will be faced with a much greater responsibility than ever before.  C