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为了帮助同学们更好的复习，小编特意为大家整理了2014年英语六级阅读练习及答案，供各位考生参考。英语六级考试马上就来了，俗话说熟能生巧勤能补拙，同学们加油练习啊! Who Knows Since no one knows what scientific discoveries will be made between now and the year A. D. 2000, each of us can make his own predictions. Our prophecies need not be completely wild guesses. We know science has moved forward rapidly in the past 50 years and will continue to do so. If we allow our imaginations to be guided by known research, our prophecies need not be sheer fantasy. We dont have to go so far as to predict that there will be invasion by men from Mars, or that all food and nourishment will be taken in capsule form, or that mechanical men will roam the world. With the scientific information that we have available now, lets make an estimate of progress in air travel. It is likely that within 50 years we shall travel through the air at a speed of 10,000 miles per hour. Too fast? Not at all. Jet-propelled planes can now travel at least 1,000 miles an hour, and jet planes will be outmoded shortly by guided missiles. The X-15 rockets speed in 1961 was 3,690 miles per hour, and scientists are hoping to double and even triple this speed. They will accomplish this speed-up, because there is no apparent scientific obstacle to prevent it. | 
