2. 外语
  3. The United States is well-known for its 【C1】______ of major higher highways designed to help a 【C2】______ get from one place to

The United States is well-known for its 【C1】______ of major higher highways designed to help a 【C2】______ get from one place to

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问题      The United States is well-known for its 【C1】______  of major higher highways designed to help a 【C2】______ get from one place to another in the shortest  possible time. 【C3】______ these wide modern roads are generally 【C4】______ and well maintained, with much sharp curves and many straight 【C5】______ , a direct route is not always the most 【C6】______ one. Large 【C7】______ often pass by scenic  areas and interesting small towns.
     Furthermore, these highways generally 【C8】______ large urban centers, which means that they become crowded with 【C9】______ traffic during rush hours, 【C10】______ the " fast, direct" route  becomes a very slow route. However, there is still always another route to take 【C11】______ you are not in a hurry. Not far from the 【C12】______ new" superhighways",  there are often older, 【C13】______ heavily traveled roads which go through the countryside. All of these are good two-lane roads; others are uneven roads 【C14】______ through the country. These secondary routes may 【C15】______  steep slopes, along high 【C16】______ , or down frightening hillsides to towns 【C17】______  in deep valleys. Through these less direct routes, longer and slower, they generally go to places 【C18】______  the air is clean and the scenery is beautiful, and the driver may have a 【C19】______  to get a fresh, clean 【C20】______  of the world.
【C14】
选项 A、travel
B、traveling
C、is traveling
D、traveled
答案B
解析 在本句，此处缺少一个现在分词作定语。
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