问题
选择题
_____ concern about food safety seems to be ______ subject that is being discussed all over the world.
A．The; a
B．A; ／
C．The; the
D．／; the
答案
答案：A
搜题请搜索小程序“爱下问搜题”
_____ concern about food safety seems to be ______ subject that is being discussed all over the world.
A．The; a
B．A; ／
C．The; the
D．／; the
答案：A
其中D是由
及y=-x所围成的区域．