and a coastline several thousand miles long.
Many lakes and rivers as well as the long coastlin
have been of great importance to the development of the country
since they made possible
the easy transportation of people and all the things people need.
transportation by water is still necessary and important.
In modern times,however trains,automobile trucks and airplanes
are doing much of the work which was formerly done by ships and boats.
17.Whats the main topic of the talk?
18.What kind of climate does the United States have?
19.What are the principal physical characteristics of the United States?
20.Whats the role of lakes and rivers according to the passage
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