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7、       Some of the bridges, like the George Washington Bridge, and some of the tunnels, such as the Lincoln and Holland Tunnels, are famous．But the most famous of all is the Brooklyn Bridge, which was built over 100 years ago．

       Today, engineers have the experience and the special machines to do such things, but at that time, no one knew how to do them．The Brooklyn Bridge was the first bridge of its kind in the world．The box which Washington had studied in Europe was used．It was the size of a house and it was made of wood．It had three sides and a top, but no bottom．Air was forced into the box and water was forced out so the workers could work underwater．No one understood the problems of this kind of work．It was very dangerous and many men were sick．Needless to say （不用說）, they were also frightened．Accidents were frequent．Roebling spent a great deal of time with the workers in the box to encourage them．

       The box began to affect the men．Some of them felt strange pains in different parts of their bodies．One day, a worker began to have strong pains in his stomach．He had been well and had begun work only half an hour before, but within minutes he was dead．This sudden incident was repeated several more times with other men．Roebling himself had a similar attack．He couldn’t talk or hear．Within days he became paralyzed（癱瘓的） and people feared that he, too, might die．But he recovered after a week or two and went back to work．A little while later, Roebling had a second attack, more serious than the first．This time he was crippled．He was unable to work again for the rest of his life．

       The bridge was a great success．People came from everywhere to see this strong and beautiful structure．It was one of the wonders of the nineteenth century, and it is still a wonder today．There is more traffic on it than ever before, yet the bridge remains sturdy．

1．Choose the one which is true．

       A．Roebling was put in charge of the building．

       B．His son returned from Europe with the idea of working in a large box underwater．

       C．Roebling was badly injured．

       D．Before dying, he asked his son to continue his work．

2．The box was used so that __________．

       A．workers working underwater could breathe and move about as if they were on the ground．

       B．workers could stand on it．

       C．more air could come to it．

       D．more water would come into it．

3．The Brooklyn Bridge is a monument to Roebling’s _________．

       A．devotion and contribution               B．interest

       C．life                              D．a(chǎn)ll of the above

4．Why was the building of Brooklyn Bridge very dangerous?

       A．Because all the workers were frightened．

       B．Because there is a rushing torrent（急流）．

       C．Because all the workers had to work underwater．

       D．Because no one was able to foretell the problems of this kind of work．