Highways in the US

The United Statesis well-known for its network of major highways designed to help a driver getfrom one

place to another inthe shortest possible time.________（51)these wide. modern roads are generally

smooth and wellmaintained,with__________(52)sharp curves and many straight sections,a directroute

is not always themost__________________(53)one.Large highways often pass_________(54)scenicareas and

interesting smalltowns.Furthermore,these highways generally_______________(55)large urbancenters which

means that theybecome crowded with_(56)traffic during rush hours,whenthe"fast,direct"

way becomes a veryslow route.However,there is_____________(57)always another route to take if youare not

in a hurry.Not farfrom the____________(58)new"superhighways",there are oftenolder,________________(59)

heavily traveledroads which go through the countryside._________(60)of these are good two-laneroads;

others are unevenroads ________ (61)through the country.These secondary routes may go up steep

slopes alonghilly__________ （62)ordown frightening hillsides to towns___________(63)in deep valleys.

Though these areless direct routes,longer and slower,they generally go toplaces____________(64)the air

is clean and thescenery is beautiful,and the driver may have a chance to get afresh,clean_____________ （65)

of the world._________(54)

A.to

B.into

C.over

D.by