A:密度不变,质量变小
B:体积不变,质量变大
C:体积变小,密度变小
D:质量不变,密度变大
—是的。你现在可以穿过马路。
—____you____the green light?
—Yes. You can cross the ____now.
A. Yes, I do
B. Yes, it is.
C. It's a tomato.
D. No, I don't. I like carrots.