在同一时刻，一幢25米的高楼，影长为20米，那么此时一根高10米的旗杆，影长为（ ）米．
A：6
B：8
C：10
D：12
Most of us, if we know even a little about where our food comes from, understand that every bite put into our mouths was alive.
Fast food is not good for health.We'd better avoid it．
