[不定项选择题]共用题干 American Roads

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________(52)and well maintained,with________(53)sharp curves and many straight
sections,a direct route is not always the most________(54)one.Large highways often pass ________(55)scenic areas and interesting small towns.Furthermore,these highways generally ________(56)large urban centers,which means that they become crowded with________(57) traffic during rush hours,________(58)the"fast,direct"route becomes a very slow route.However,there is almost always another route to take________(59)you are not in a hurry.Not far from the________(60)new"superhighways",there are often older,________(61)heavily traveled roads which go through the countryside.________(62)of these are good two-lane roads;
others are uneven roads curving through the country.These secondary routes may go up steep slopes,along high________(63),or down frightening hillside to towns________(64)in deep valleys.Through these less direct routes,longer and slower,they generally go to places________ (65)the air is clean and scenery is beautiful,and the driver may have a chance to get a fresh,clean view of the world. _________(60)
A.relatively
B.regularly
C.respectively
D.reasonably