【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。
Highways in the US
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 an-other 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、
B．into
C．over
D．by
网考网参考答案：D
网考网解析：
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