Which two of the following sentences from the article include central ideas?
1. They had heard tales of
thousands of people being
sacrificed at the Great
Temple's dedication
2. Nearly 500 years later,
scientists digging in Mexico
City have unearthed the skulls.
3. They have had trouble coming up with a more detailed explanation, however, and the
full story of the skulls may have died with the Aztecs.
4. In 1985, for example, ruins
were found during the cleanup that followed an earthquake