一本故事书有m页,小明已经读了7天,平均每天读n页,小明读了______页.
7×n=7n(页),
答:小明读了7n页,
故答案为:7n.
---Do you mind lending me some money? I left my purse at home this morning.
---__________. Here is one hundred yuan.
A.Never mind.
B.With pleasure.
C.Of course not.
D.Yes, I do.
变色硅胶由蓝色变()色时,表明须更换硅胶。
A、白
B、黄
C、红
D、黑