（）不是旱地杂草，不会为害小麦。
A、荠
B、马齿苋
C、牛毛毡
D、牛繁缕
参考答案：C
We have ______ our position on the issue! Whatever happens, we won't change it. [ ]
A. explained
B. concluded
C. introduced
D. clarified
肝炎病毒
