问题
选择题
They were trying to remove harmful ______ from cigarettes.
A．content
B．substances
C．materials
D．mixtures
答案
答案：B
此处意思：物质，物体，B项有此意。
搜题请搜索小程序“爱下问搜题”
They were trying to remove harmful ______ from cigarettes.
A．content
B．substances
C．materials
D．mixtures
答案：B
此处意思：物质，物体，B项有此意。
