回答题：·Read the article below about highways in the

回答题：

·Read the article below about highways in the United States．

·Choose the best word or phrase to fill each gap from A，B，C or D on the opposite page．

·For each question（19-33），mark one letter（A，B。C or D）on your Answer Sheet．

·There is arr example at the beginning（0）．

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．（19） ______these de modem roads are generally（20）______and weft maintained with（21） sharp CUn，es alld straight sect-ions，a direct route is not always the most（22） one．Large highways often pass（23）______ scenic areas and interesting small towns．Furtherrnore．these highways generally（24）______large urban centers，which means that they become crowded with（25）______traffic during rush hours，（26）the“fast，direct”route becomes a very slow route．

However，there is almost always another route to take（27）______you are not in a hurry Not far from the（28）…．．．．new“superhighways”，there are often older（29） heavily traveled roads which go through the countryside． （30）______of these are good tw0—lane r。ads；others are uneven roads curving throut the c。untry．These secondary routes may go up steep slopes，along high（31）______，or down frightening hillside to towns（32）______in deep valleys．Through these less direct routes，longer and slower，they generaly go to places（33）______the air is clean and scenery is beautiful，and the driver may have a chance to get a flesh，clean view of the world．

19题答案为 查看材料

A.Although

B.Since

C.Because

D.Therefore

请帮忙给出正确答案和分析，谢谢！