用（）钢材制造的钢管可输送净化天然气。
A.16Mn
B.10号钢
C.20号钢
D.A3钢
参考答案：A
—I’ve just heard that the lecture to be given by the Nobel winner has been cancelled.
— Oh, no! ______.
A．It’s wonderful
B．It doesn’t matter
C．I have no idea
D．I was looking forward to that
进口货物的收货人自运输工具申报进境之日起，超过( )时间未向海关申报的，其进口货物由海关提取依法变卖处理。
A．1个月 B．3个月 C．6个月 D．12个月
