Which two of the following statements are MAIN ideas of the article? 1. People might have been able to cross from Siberia to Alaska by using a land bridge now covered with water. 7 2. Vitus Bering went on two voyages across the water that became known as the Bering Strait. 3. David M. Hopkins is a scientist who helped to create the Bering Land Bridge National Preserve. 4. New theories suggest the first humans came to the Americas long before using the Bering Land Bridge.