小题1:Shall we play basketball tomorrow? A
题型：完形填空
问题：
小题1:Shall we play basketball tomorrow? A. For five hours
小题2: Have you ever been to an aquarium? B. Yes, it is.
小题3: How long have you been skating? C. Sorry, I’m busy tomorrow.
小题4:It’s windy today, isn’t it? D. No, I haven’t
小题5:Let’s go shopping then. E. OK. I’ll meet you at the shopping center at 10 o’clock
和
同时有效，在
端加上有效的低电平，此时
的电平（）。