The United States is well-known for its network of major highways designed t

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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. [br]

选项 A、Although
B、Since
C、Because
D、Therefore

答案 A

解析从句子结构看，这里需要填入一个连接词引出从句。D项Therefore是副词，不是连接词，可首先排除。A项Although意思是“虽然；尽管”，可引导让步状语从句；B项Since意思是“因为；鉴于”，C项Because意思是“因为”，二者都可以引导原因状语从句。从上下文的意义来看，从句与主句之间不是因果关系，而是让步关系，所以应该选A。

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