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.【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.
【C9】
选项 A、when
B、for
C、but
D、that
答案A
解析 首先我们必须清楚，这里使用的是一个非限制性定语从句，在这里只有when才可以起这种语法作用。例如：Mozart showed genius even at the age of six，when he began to compose minuets．莫扎特6岁就开始创作小步舞曲，显示出了他非凡的天赋。
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