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.【C1】______ these wide modem roads are generally【C2】______ and well maintained, with【C3】______ sharp curves and many straight【C4】______ , a direct route is not always the most【C5】______ one. Large highways often pass【C6】______ scenic areas and interesting small towns, Furthermore, these highways generally【C7】______  large urban centers, which means that they become crowded with【C8】______ traffic during rush hours,【C9】______ the "fast, direct" route becomes a very slow mute.
     However, there is【C10】______ always another route to take【C11】______ you are not in a hurry. Not far from the 【C12】______ new "suqerhighways’, there are often older, 【C13】______ heavily traveled roads which go through the countryside.【C14】______ of these are good two-lane roads; others are uneven roads【C15】______ through the country. These secondary routes may go up 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。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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