8

　　and you know why． Automobiles are much heavier than

　　9

　　. The river is much

　　10

　　than the stream．A long wood bridge just won't

　　11

　　．It isn't strong enough．It would

　　12

　　and break under its own weight．The fisherman's problem is very

　　13

　　．However, the engineer's is not．

　　But don't

　　14

　　sorry for the engineer．He doesn't have to

　　15

　　the very beginning with a long board．People have been thinking about bridges for thousands of years．They have designed many types of bridges．Each bridge is suited to its special

　　16

　　．The engineer can choose the type best suited to the river and the

　　17

　　nearby．

　　What choice does he have, and why is one

　　18

　　than the others? One way for you to find out is to make a few bridges out of cardboard．They won't be strong enough to

　　19

　　a five-ton truck, but you will find out some of the main

　　20

　　of bridge design by doing some experiments．

　　1．A．clothes

　　B．socks

　　C．legs

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