The United States is well-known for its network of major highways designed to help a driverget from one place to another in the shortest possible time. ___61___ these wide modern roads aregenerally ___62___ and well maintained, with ___63___ warp curves (弯道） and many ___64___ sections, adirect route is not always ___65___ enjoyable one. Large highways often pass ___66___ scenic areas andinteresting small towns. Furthermore, these highways generally ___67___ large urban centers, whichmeans that they become crowded with ___68___ traffic during rush hours, when the“fast, direct”waybecomes a very ___69___ route. 

However, there ___70___ almost always another route to take ___71___ you are not in a hurry. Not far ___72___the relatively new“superhighways”,there are often older，___73___ heavily traveled roads which gothrough the countryside. ___74___ of these are good two-lane ( 双车道）roads; others are uneven roadscunning through the country. These secondary routes may ___75___ steep slopes (陡坡), along high cliffs,or down frightening hillsides to towns ___76___ in deep valleys. Through these less direct ___77___ , longer andslower, they generally go to places ___78___ the air is clean and the scenery is beautiful, and the driverhave a___ 79___ to get a fresh, clean ___80___ of the world.

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