题目选项分析

Once extremely expensive and used primarily for ornamental or decorative purposes, a metal now known as aluminum, which can be effective in an ever-expanding suite of production applications for a relatively low cost, is now used in food packaging, structural engineering, and bicycle manufacture.

Once extremely expensive and used primarily for ornamental or decorative purposes, a metal now known as aluminum, which can be effective in an ever-expanding suite of production applications for a relatively low cost, is now used in food packaging, structural engineering, and bicycle manufacture.