题干
The mom was so young that she was always worried about how to ______ her baby.
A：look up
B：look for
C：look after
D：look in
答案(点此获取答案解析）
C
2SO3，平衡时SO3为n mol，在相同温度下，分别按下列配比在上述容器中放入起始物质，平衡时SO3的物质的量可能大于n的是（ ）