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In the days of Samuel Clemens, better known as Mark Twain, life on a steamboat on the Mississippi River was 1 . One of the most exciting 2 of that period was a race 3 two of the fastest river boats. The Natchez had steamed up the river from New Orleans to St. Louis in three days, twenty-one hours, and fifty-eight minutes. John Cannon, 4 of the Robert E. Lee felt sure that he could 5 this time and challenged the captain of the Natchez. 6 his boat light, Captain Cannon 7 no passengers 8 ; he did not 9 the usual goods. Moreover, he had crews with supplies of coal waiting on floats along the river so that the boat would not have to put it to shore for 10 . The race began on June 30,1870. Being lighter than the Natchez, the Lee jumped into an early lead. For three days the race continued, 11 the boats travelling at full steam. They were 12 each other the whole time, 13 short spaces when bends in the river hid one or the other from view. Then only a few hours from its goal, the Natchez 14 a rock and ran aground. The Lee steamed proudly into St. Louis in exactly three days, eighteen hours, and thirty minutes after she had left New Orleans. Bell rang, and people called 15 the boat named after the general 16 as an army engineer had prevented the river from changing its course and St. Louis 17 becoming an inland town. The Lee 18 a good record—one that brought honor to all rivermen. However, the great day of the river steamers was drawing to 19 . The 20 won the passenger and goods business from the river boats. There are boats on the river today. But they are not the white birds that attracted young Samuel Clemens.
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In the days of Samuel Clemens, better known as Mark Twain, life on a steamboat on the Mississippi River was 1 . One of the most exciting 2 of that period was a race 3 two of the fastest river boats. The Natchez had steamed up the river from New Orleans to St. Louis in three days, twenty-one hours, and fifty-eight minutes. John Cannon, 4 of the Robert E. Lee felt sure that he could 5 this time and challenged the captain of the Natchez. 6 his boat light, Captain Cannon 7 no passengers 8 ; he did not 9 the usual goods. Moreover, he had crews with supplies of coal waiting on floats along the river so that the boat would not have to put it to shore for 10 . The race began on June 30,1870. Being lighter than the Natchez, the Lee jumped into an early lead. For three days the race continued, 11 the boats travelling at full steam. They were 12 each other the whole time, 13 short spaces when bends in the river hid one or the other from view. Then only a few hours from its goal, the Natchez 14 a rock and ran aground. The Lee steamed proudly into St. Louis in exactly three days, eighteen hours, and thirty minutes after she had left New Orleans. Bell rang, and people called 15 the boat named after the general 16 as an army engineer had prevented the river from changing its course and St. Louis 17 becoming an inland town. The Lee 18 a good record—one that brought honor to all rivermen. However, the great day of the river steamers was drawing to 19 . The 20 won the passenger and goods business from the river boats. There are boats on the river today. But they are not the white birds that attracted young Samuel Clemens.
In the days of Samuel Clemens, better known as Mark Twain, life on a steamboat on the Mississippi River was 1 . One of the most exciting 2 of that period was a race 3 two of the fastest river boats. The Natchez had steamed up the river from New Orleans to St. Louis in three days, twenty-one hours, and fifty-eight minutes. John Cannon, 4 of the Robert E. Lee felt sure that he could 5 this time and challenged the captain of the Natchez. 6 his boat light, Captain Cannon 7 no passengers 8 ; he did not 9 the usual goods. Moreover, he had crews with supplies of coal waiting on floats along the river so that the boat would not have to put it to shore for 10 . The race began on June 30,1870. Being lighter than the Natchez, the Lee jumped into an early lead. For three days the race continued, 11 the boats travelling at full steam. They were 12 each other the whole time, 13 short spaces when bends in the river hid one or the other from view. Then only a few hours from its goal, the Natchez 14 a rock and ran aground. The Lee steamed proudly into St. Louis in exactly three days, eighteen hours, and thirty minutes after she had left New Orleans. Bell rang, and people called 15 the boat named after the general 16 as an army engineer had prevented the river from changing its course and St. Louis 17 becoming an inland town. The Lee 18 a good record—one that brought honor to all rivermen. However, the great day of the river steamers was drawing to 19 . The 20 won the passenger and goods business from the river boats. There are boats on the river today. But they are not the white birds that attracted young Samuel Clemens.
Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future. The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types. Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion. One proposed solution to this problem is the automated highway system. When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the ear will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car’s movements. The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wait for the buzzer that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway. What provides autos with electric power in an automated highway system
They weighed the advantages of the operation ______ all the possible risks involved over and over again.
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