－I think teenagers should be allowed to go out with their friends in the evening.

－             It's not safe enough. [ ]

A. I agree                  

B. I think so

C. I don't know              

D. I disagree

砂的细度模数以两次试验结果的算术平均值为测定值，如两次试验所得细度模数之差大于（）时，应重新取样进行试验。

A.0.1

B.0.2

C.0.3

D.0.5