题目内容
书面表达
美国概况美国位于北美的中心，北面与加拿大相邻，南边与墨西哥相邻，靠东是大西洋，靠西是太平洋。美国有很多大城市，如纽约、华盛顿、芝加哥等。有很多大山，东边是 the Appalachian Mountains，西边是 Rocky Mountains．主要的河流是密西西比河，其流向自北向南，位于美国的东部。(词数：80左右)
参考词汇：
(1)中心地 the central part
(2)与……相邻 to be bordered on…
(3)靠东(西)to the east(west)of…
(4)自北向南流 to run from north to south
(5)墨西哥 Mexico
(6)密西西比河 the Mississippi River
(7)大西洋 the Atlantic Ocean
(8)太平洋 the Pacific Ocean
解析：
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One possible version： The United States The United States is located in the central part of North America．It is bordered on the north by Canada and on the south by．To the east is the Atlantic Ocean and to the west is the Pacific Ocean． The country has many large cities Among the most famous are New York,Washington,and Chicago． The main mountains are the Appalachian Mountains in the east，and the Rocky Mountains in the west．The major river is the Mississippi River． River．It runs from north to south in the east central part of America． |
