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 an

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

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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 modem 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】______ of- ten 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 al- ways 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.
【C11】
选项 A、unless
B、if
C、as
D、since
答案B
解析 根据上下句的关系，我们可以看出：这里要使用一个条件从句，而不是原因从句，故C和D错误。又因为A用在此处，表达的意义与文章所要表达的内容正好相反，故A也是错误的。
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