专四模拟试题（完型篇10）

文章作者 100test 发表时间 2011:03:17 21:27:23
来源 100Test.Com百考试题网

　　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. ___1___ these wide modern roads are generally ___2___