某桥全长130m。主跨为1OOm钢筋混凝土箱形拱桥，下部结构东岸为组合式桥台，西岸为

     Hidden passengers traveling in ships, trains, or even cars can be a terrible trouble-especially when they
are insects. As for this, there is a great   1   between human beings and insects. The former   2   every
possible effort to avoid being discovered, while the latter quickly  3    attention to themselves.
     We can only show mercy to the   4   man who had to stop his car soon after   5   from a country village
to drive to London. Hearing a strange noise from the   6   of the car, he naturally got out to   7   the wheels
 carefully, but he found nothing wrong, so he   8   his way. Again the noise began   9   and became even
louder. Quickly  10   his head, the man saw what appeared to be a great  11   cloud following the car. When
he stopped at a village further on, he was told that a queen been must be hidden in his car as there were
thousands of bees  12  .
     On learning this, the man drove away as quickly as possible. After an hour's   13   driving, he arrived
safely in London, where he parked his car outside a  14   and went in. It was not long   15   a customer who
had seen him arrive   16   in to inform him that his car was   17   with bees. The poor driver was   18   that
the best way should be to call a  19  . In a short time the man arrived. He found the unwelcome passenger
hidden near the wheels at the back of the car. Very thankful to the driver for this   20  gift, the bee-keeper took
the queen and her thousands of followers home in a large box.