问题
单项选择题
The earliest process for mining gold is panning, which involves using a circular dish with a small pocket at a bottom.
答案
参考答案：a bottom→the bottom
搜题请搜索小程序“爱下问搜题”
The earliest process for mining gold is panning, which involves using a circular dish with a small pocket at a bottom.
参考答案：a bottom→the bottom
