单选题
阅读下面的短文,文中有15处空白,每处空白给出了4个选项,请根据短文的内容从4个选项中选择1个最佳答案。
{{B}} Highways in the US{{/B}}
The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. {{U}}(51) {{/U}} these wide modern roads are generally smooth and well maintained, with {{U}}(52) {{/U}} sharp curves and many straight sections, a direct route is not always the most {{U}}(53) {{/U}} one. Large highways often pass {{U}}(54) {{/U}} scenic areas and interesting small towns. Furthermore, these highways generally {{U}}(55) {{/U}} large urban centers which means that they become crowded with {{U}}(56) {{/U}} traffic during rush hours, when the "fast, direct" way becomes a very slow route. However, there is {{U}}(57) {{/U}} always another route to take if you are not in a hurry. Not far from the {{U}}(58) {{/U}} new "superhighways", there are often older, {{U}}(59) {{/U}} heavily traveled roads which go though the countryside. {{U}}(60) {{/U}} of these are good two lane roads; others are uneven roads {{U}}(61) {{/U}} through the country. These secondary routes may go up steep slopes along hilly {{U}}(62) {{/U}} or down frightening hillsides to towns {{U}}(63) {{/U}} in deep valleys. Though these are less direct routes, longer and slower, they generally go to places {{U}}(64) {{/U}} the air is clean and the scenery is beautiful, and the driver may have a chance to get a fresh, clean {{U}}(65) {{/U}} of the world.
【正确答案】 A
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【正确答案】 B
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【正确答案】 C
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【正确答案】 D
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【正确答案】 B
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【正确答案】 D
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【正确答案】 C
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【正确答案】 A
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【正确答案】 B
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【正确答案】 D
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【正确答案】 C
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【正确答案】 B
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【正确答案】 A
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【正确答案】 D
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【正确答案】 A
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