【简答题】America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere(半球). The Mike O’Callaghan-Pat Tillman Memorial B...
【简答题】阅读理解。 America's greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere(半球).The Mike O'Callaghan-Pat Tillman Memor...