单项选择题
| The geographical location of a country
and its physical (67) are very important to its development
and (68) . The United States is very (69)
in this (70) . (71) , it has good (72) . In almost every (73) of the country it is possible to live (74) during the whole year. It is true that in the south it sometimes gets very hot and in the north very cold. But the people who live in these regions become (75) to the climate and never (76) much when the weather is either very hot or very cold. In a large country there is usually a great (77) of different physical characteristics. In the United States, there are wide plains and high mountains, thousands of lakes and rivers of all (78) , cool forests and hot deserts, and a coastline several’ thousand miles long. The many lakes and rivers, (79) he long coastline, have been (80) great importance to the development of the country, since they made possible the easy (81) of the people and all the things people (82) . Ships and boats are still necessary and important. In modem (83) , (84) , trains, automobiles, trucks and airplanes are doing much of the (85) which was (86) done by ships and boats. |