下列晶体中，不属于原子晶体的是（ ）
A．干冰
B．水晶
C．晶体硅
D．金刚石
答案：A
Many famous movie stars attended the news briefing (新闻发布会), Jackie Chan and Jet Li. [ ]
A. include
B. including
C. included
D. includes
初轧机开轧时，钢坯端部成（），轧件易于咬入。
