题干
在横线上填上一个单词或句子
A:____
B: I'm fine, thanks. And you?
A: I'm OK.____?
B: It's a book.
A:____?
B: It's red.
A:____?
B: Yes. B-O-O-K , book .
A:____.
B: You are welcome.
答案(点此获取答案解析）
How are you?,What's this(in English )?,What color is it?,Can you spell it, please?,Thank you.
cm/s的速度运动，分别连结AF，CE．设点F运动时间为t（s），其中t＞0． 