题目内容：
根据材料，回答问题In the days of Samuel Clemens，better known as Mark Twain，life on a steamboat On the Missis． sippi River was___41___．One of the most exciting ___42___ pf that period was a race___43___ two of the fastest river boats．
The Natchez had steamed up the fiver from New Orleans to St．Louis in three days，twenty．one hours，and fifty—eight minutes．John Cannon，．440f the Robert E．Lee felt sure that he could 45 this time and challenged the captain of the Natchez．46 his boat light，Captain Cannon 47no passengers ___48___ ；he did not ___49___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 ___50___．The race began on June 30，1 870．Being lighter than the Natchez，the Lee jumped into an early lead．For three days the race continued， ___51___ the boats traveling at full steam．They were___52___each other the whole time，___53___ short spaces when bends in the river hid one or the other from view．Then only a few hours from its goal，the Natchez ___54___a rock and ran aground(搁浅)．The Lee steamed proudly into St．Louis in exactly three days，eighteen hours，and thirty mi． nutes after she had left New Orleans．Bell rang，and people called___55___ the boat named after the general___56___as an army engineer had prevented the river from changing its course and St．Louis 57becoming an inland town．
The Lee___58___a good record-one that brought honor to all rivermen．However，the great day of the river steamers was drawing to___59___．The ___ 60___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 attrac． ted young Samuel Clemens．
41． A．an adventure
B．a story
C．an experience
D．a creation
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