以下哪项不是新闻摄影主题的特点（）
A、新闻性
B、真实性
C、直接性
D、延时性
参考答案：D
—______ did you start to play football?
—I started to play football when I was six. [ ]
A. When
B. How long
C. What time
D. How soon
已知：△ABC≌△DEF，若AB=10cm，则DE=______cm．
