One of the most popular activities enjoyed by Americans is spending time in forests and walking along paths through the country.This activity，called hiking，has led to the creation of paths throughout the United States.
One of the longest is the Appalachian National Scenic Trail.The trail is the first pleted part of the National Trails System.The trails system was established by Congress and the president in 1968.The Appalachian Trail is more than 3,400 kilometers long.It starts in the northeastern state of Maine and ends in the southeastern state of Georgia.The trail goes through 14 states.They are Maine，New Hampshire，Vermont，Massachusetts，Connecticut，New York，New Jersey，Pennsylvania，Maryland，West Virginia，Virginia，Tennessee，North Carolina，and Georgia.
The path takes walkers through the Appalachian Mountains.They extend from the Canadian province of Quebec to the southern American state of Alabama.
The Appalachian Mountains are among the oldest on Earth.They first began forming about one thousand million years ago.During the millions of years since then，the mountains were changed and reformed by the forces of water and wind.Ice also changed the mountains，making many of them smaller and digging valleys and lakes among them.Many different kinds of trees grow along the trail.And many different kinds of animals live in the forests along the trail.
Lands along the trail are protected by the federal government and by state governments.Some parts are not protected by the government directly.Instead，they are protected by legal agreements with private owners willing to permit people to walk across their property.
Walkers on the Appalachian Trail pass through some of the great valley systems of the mountains.They can look down into these beautiful valleys and see farms and forests stretching across the land for many kilometers.Farmland in the valleys is rich and productive.And some of the great events in American history took place in the valleys.For example，one of the great battles of the American Civil War was fought in the Shenandoah Valley in Virginia.
【小题1】The Appalachian Trail .A．is more than four thousand three hundred kilometers longB．starts in the northern state of MaineC．goes through more than fourteen statesD．ends in the southeastern state of Georgia【小题2】The Appalachian Mountains .A．are the first pleted part of the National Trails SystemB．began forming one million years agoC．were changed by natural forces like water，wind and iceD．were around by valleys and rivers and famous for its scenery【小题3】The lands along the trail .A．are protected entirely by either the federal government or state governmentsB．are mainly protected by legal agreements with private ownersC．can be visited by travelers freely only under the permission of ownersD．are protected by both the federal government and state governments【小题4】What is mainly described in the last paragraph?A．The Appalachian Mountains have some great valley systems.B．Farms and grasslands stretch across the valleys for many kilometers.C．One of the American independence battles was fought in the Shenandoah Valley.D．Lakes in the Appalachian Mountains are one of the most beautiful sights.D
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(答案→)D
解析：
【小题1】 D
解析 细节理解题。根据文章第二段可知，A项数字错误；B项地理位置描述欠精确；C项应该把more than去掉。
【小题2】 C
解析 细节理解题。根据第四段第三、四句可知，水、风以及冰川都对山貌的变化起到了一定作用，而这些都是自然力。
【小题3】 D
解析 细节理解题。由第五段第一句可知，这些土地同时受联邦政府和州政府的保护。
【小题4】 A
解析 主旨大意题。最后一段提到农场和森林绵延数公里，并没有提到grassland，因此B项错误；文中提到的历史事件是发生在美国内战时期，而非独立战争时期，所以C项错误；D项文中没有提到；只有A项内容与本段的主旨句第一句相符。