2. 外语
  3. 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

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

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问题     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. 【51】these wide modern roads are generally smooth and well maintained, with【52】sharp curves and many straight sections, a direct route is not always the most【53】one. Large highways often pass by scenic areas and interesting small towns.  Furthermore, these highways generally【54】large urban centers which means that they become crowded with heavy traffic during rush hours,【55】the "fast, direct" way becomes a very slow route.
    However, there is almost always another route to take【56】you are not in a hurry. Not far from the【57】new "super highways", there are often older, less heavily traveled roads which go through the countryside. 【58】of these are good two-lane roads; others are uneven roads curling through the country.  These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns【59】in deep valleys.  Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a【60】to get a fresh, clean view of the world.  
选项 A、unless
B、if
C、as
D、since
答案B
解析 从上下文的意思可以看出，这里应该是一个表示条件的从句，“如果你不着急，几乎总是有另一条路可走。”因此，B项if“如果，假如”是最佳选择。A项unless意思是“除非”，也可表示条件，相当于if…not…，但此句已经是否定结构了，因此不可选A项，否则意思正好相反。C项as“因为”和D项since“既然”不表示条件，也不能选。
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