我们要采取一切措施防止以后不再发生这种严重的错误。
参考答案：我们要采取一切措施防止以后再发生这种严重的事故。
—Can you tell me___________?
—We are very good friends. [ ]
A. how you get on with Joe
B. who your best friend is
C. what you are going to be
D. what he looks like
按矿物颗粒形态，岩浆岩的结构可分为（）（）（）（）等.
