【单选题】By the first century A.D, historians say, the Chinese had some knowledge of the winds and currents of the Pacific. When weather prevented the Chinese from navigating by the sky their mariners(水手) used...
【简答题】A.They keep some record of historians' achievements. B.They build monuments and write the stories of historians down. C.They continued to look for new information which helps us understand the past mo...
【单选题】Some historians say that the most important contribution of Dwight Eisenhower's Presidency (总统任期)in the 1950s was the U. S. interstate highway system. It was a 【B1】 project, easily surpassing the scal...