It’s summertime. For many Americans, this is the season to travel. Why? Because school is out. Because the weather is great. And

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问题      It’s summertime. For many Americans, this is the season to travel. Why? Because school is out. Because the weather is great. And most of all, because we all【B1】______ a break.
    Americans are used to traveling. Most companies【B2】______ an annual vacation for their employees, and people often use that time to travel. Some people just visit friends or relatives in【B3】______ states. Others go on low-budget weekend【B4】______ and stay in economy motels. Meanwhile, camping out in the great outdoors【B5】______ to adventurous types.
    Most Americans prefer to travel within their nation’s borders. Why? For one thing, it’s cheaper than traveling abroad, and there’s no language problem. But besides that, the vast American territory offers【B6】______ tourist attractions. Nature lovers can 【B7】______ beaches, mountains, canyons, lakes and a wealth of natural wonders. Major cities offer visitors a multitude of urban delights. The【B8】______ of modern freeways, railways and airplanes makes travel in America as easy as pie.
    Many American vacations are as unique as the people who, take them. Environmentalists prefer "green vacations."【B9】______ . History buffs seek out famous historical sites and museums. Families often plan their trips with the kids in mind,【B10】______ .
    Americans aren’t the only people in the world who travel. International business, mass communication and jet airplanes have created a world of globetrotters. People all over the world enjoy going abroad to travel.【B11】______ .
【B9】

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答案These trips allow them to observe animals and plants up-close without disturbing the sensitive balance of nature

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