我国南极泰山站于2014年2月8日正式开站，结合如图，回答下面小题。
On the square there is a huge rock, and people don't know how to move it away.
— Excuse me, could you please tell me if the sports meeting ______ on time?
— Hard to say. If it ______ tomorrow, we’ll have to put it off.
2的相反数是（ ）
2SO3（g），下列叙述正确的是