The palm tree is an essential source of food and——for people living in the tropics.
问题描述:
The palm tree is an essential source of food and——for people living in the tropics.
built materials
to build materials
material buildings
building materials
给出正确答案,给出理由和翻译
答
building materials 建筑材料.(其余三项都没有建筑材料的意思.)
翻译:棕榈树是热带地区人们食物和建筑材料的重要来源.