下图为某山地的局部等高线图,等高距为20米,AB为空中索道。回答下列问题。
A该球是白球;
B该球是黄球;
C该球是红球.
选择5种不同的颜色,按一定规律串联彩灯.
– Mum, I've been studying English since 8 o'clock. _____ I go out and play with Tom for a while?– No, I'm afraid not. Besides, it's raining outside now.