猛犸象的化石显示它们有厚厚的毛发来抵御冰河时期的寒冷。

Fossils show that ___mammoths had thick fur to survive the cold during the Ice Age.

组织这场音乐节是一项庞大的工程，需要数百人的共同努力。

Organizing this music festival is a ___mammoth task that requires hundreds of people to work together.